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Boldo
Also known as: 28772-56-7, Broprodifacoum, Bromadiolon, Bromatrol, Contrac, Ratimus
Molecular Formula
C30H23BrO4
Molecular Weight
527.4  g/mol
InChI Key
OWNRRUFOJXFKCU-UHFFFAOYSA-N

1 2D Structure

Boldo

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
3-[3-[4-(4-bromophenyl)phenyl]-3-hydroxy-1-phenylpropyl]-4-hydroxychromen-2-one
2.1.2 InChI
InChI=1S/C30H23BrO4/c31-23-16-14-20(15-17-23)19-10-12-22(13-11-19)26(32)18-25(21-6-2-1-3-7-21)28-29(33)24-8-4-5-9-27(24)35-30(28)34/h1-17,25-26,32-33H,18H2
2.1.3 InChI Key
OWNRRUFOJXFKCU-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C(C=C1)C(CC(C2=CC=C(C=C2)C3=CC=C(C=C3)Br)O)C4=C(C5=CC=CC=C5OC4=O)O
2.2 Synonyms
2.2.1 MeSH Synonyms

1. Bromodialone

2.2.2 Depositor-Supplied Synonyms

1. 28772-56-7

2. Broprodifacoum

3. Bromadiolon

4. Bromatrol

5. Contrac

6. Ratimus

7. Boldo

8. Temus

9. Sup'operats

10. Super-rozol

11. Boot Hill

12. Canadien 2000

13. Maki

14. Bromone

15. Super-caid

16. Chebi:81855

17. Lm-637

18. 3-[3-[4-(4-bromophenyl)phenyl]-3-hydroxy-1-phenylpropyl]-4-hydroxychromen-2-one

19. 3-(3-(4'-bromo(1,1'-biphenyl)-4-yl)3-hydroxy-1-phenylpropyl)-4-hydroxy-2h-1-benzopyran-2-one

20. 2h-1-benzopyran-2-one, 3-[3-(4'-bromo[1,1'-biphenyl]-4-yl)-3-hydroxy-1-phenylpropyl]-4-hydroxy-

21. Bromore

22. Contrax

23. Topidion

24. Eradic

25. Rafix

26. Super-cald

27. (hydroxy-4 Coumarinyl 3)-3 Phenyl-3 (bromo-4 Biphenylyl-4)-1 Propanol-1

28. Coumarin, 3-(3-(4'-bromo-1,1'-biphenyl-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxy-

29. Dsstox_cid_12589

30. Dsstox_rid_78997

31. Dsstox_gsid_32589

32. 2h-1-benzopyran-2-one, 3-(3-(4'-bromo(1,1'-biphenyl)-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxy-

33. Bromodiolone

34. Caswell No. 486ab

35. Bromadiolone [bsi:iso]

36. Broprodifacoum [south Africa]

37. Cas-28772-56-7

38. Hsdb 6458

39. Einecs 249-205-9

40. Epa Pesticide Chemical Code 112001

41. Brn 1335336

42. Bromadialone

43. Tamogam

44. Slaymor (salt/mix)

45. 3-(4-hydroxycoumarin-3-yl)-3-phenyl-1-(4-bromobiphenyl)propan-1-ol

46. 3-(alpha-(p-bromophenyl)-beta-hydroxyphenethyl)benzyl-4-hydroxycoumarin

47. 3-(3-(4'-bromobiphenyl-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxycoumarin

48. 3-(4-hydroxy-2-oxochromen-3-yl)-3-phenyl-1-(4-bromobiphenyl)propan-1-ol

49. 3-(alpha-(p-(p-bromophenyl)-beta-hydroxyphenethyl)benzyl)-4-hydroxycoumarin

50. Coumarin, 3-(alpha-(p-(p-bromophenyl)-beta-hydroxyphenethyl)benzyl)-4-hydroxy-

51. (hydroxy-4 Coumarinyl 3)-3 Phenyl-3 (bromo-4 Biphenylyl-4)-1 Propanol-1 [french]

52. (hydroxy-4-coumarinyl-3)-3-phenyl-3-(bromo-4-biphenylyl-4)-1-propanol-1 [french]

53. Rentokil Deadline (salt/mix)

54. Schembl433993

55. Schembl5933914

56. Chembl1165553

57. Dtxsid9032589

58. Tox21_112561

59. Tox21_301920

60. (hydroxy-4-coumarinyl-3)-3-phenyl-3-(bromo-4-biphenylyl-4)-1-propanol-1

61. Akos015907923

62. Akos030254788

63. Tox21_112561_1

64. 3-(3-(4'-bromo(1,1'-biphenyl)-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxy-2-benzopyrone

65. 3-[3-[4-(4-bromophenyl)phenyl]-3-hydroxy-1-phenylpropyl]-2-hydroxychromen-4-one

66. Ncgc00163939-01

67. Ncgc00163939-02

68. Ncgc00255356-01

69. Ac-12416

70. Bromadiolone 100 Microg/ml In Acetonitrile

71. Db-047454

72. Bromadiolon, Pestanal(r), Analytical Standard

73. C18596

74. 772b567

75. A819585

76. Q423091

77. J-017254

78. 3-(.alpha.-(p-(p-bromophenyl)-.beta.-hydroxyphenethyl)benzyl)-4-hydroxycoumarin

79. 3-(1-phenyl-3-hydroxy-3-(4-(4-bromophenyl)pheny)propyl)-4-hydroxy-coumarin

80. 3-(3-(4'-bromo-(1,1'-biphenyl)-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxy-coumarin

81. 3-(3-(4'-bromobiphenyl-4-yl)-3-hydroxy-1-phenylpropyl)-4-hydroxy-2h-chromen-2-one

82. 3-[3-[4-(4-bromophenyl)phenyl]-3-hydroxy-1-phenylpropyl]-2-hydroxy-1-benzopyran-4-one

83. 3-[3-[4-(4-bromophenyl)phenyl]-3-oxidanyl-1-phenyl-propyl]-2-oxidanyl-chromen-4-one

84. Coumarin, 3-(.alpha.-(p-(p-bromophenyl)-.beta.-hydroxyphenethyl)benzyl)-4-hydroxy-

85. 3-[3-(4'-bromo[1,1'-biphenyl]-4-yl)-3-hydroxy-1-phenylpropyl]-4-hydroxy-2h-chromen-2-one

2.3 Create Date
2011-12-26
3 Chemical and Physical Properties
Molecular Weight 527.4 g/mol
Molecular Formula C30H23BrO4
XLogP36.1
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count4
Rotatable Bond Count6
Exact Mass526.07797 g/mol
Monoisotopic Mass526.07797 g/mol
Topological Polar Surface Area66.8 Ų
Heavy Atom Count35
Formal Charge0
Complexity744
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count2
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Pharmacology and Biochemistry
4.1 MeSH Pharmacological Classification

Anticoagulants

Agents that prevent BLOOD CLOTTING. (See all compounds classified as Anticoagulants.)


Rodenticides

Substances used to destroy or inhibit the action of rats, mice, or other rodents. (See all compounds classified as Rodenticides.)


4.2 Absorption, Distribution and Excretion

Rats (Rattus norvegicus) dosed orally with the rodenticide bromadiolone (0.8 and 3 mg/kg) were sacrificed in groups of 4 rats at various times up to 97 hr after administration. Bromadiolone was assayed in plasma, liver and kidney. ... The compound disappeared slowly from the organism with a half-life of 25.7 hr for the 0.8 mg/kg dose and 57.5 hr for the 3 mg/kg. Concentrations in liver were rapidly established and were 14- to 46-fold higher than plasma concentrations. /Liver concentrations were about 1.5 ug/g/ 97 hr after 8 mg/kg dose. Bromadiolone levels in kidney were slightly higher than those observed in plasma with a longer half-life.

PMID:3444841 Kamil N; Pharmacol Res Commun 19 (11): 767-76 (1987)


Groups of male Sprague-Dawley rats received a single dose (0.2 mg/kg bw) of brodifacoum, bromadiolone, or flocoumafen by gavage. A control group consisting of 9 male rats which received nothing was also included in the study. .... During the first 28 days after dosing, the decline of the liver concns of bromadiolone and flocoumafen was faster than that of brodifacoum as indicated by the t1/2's of these 3 chemicals at the first 28 days (brodifacoum: t1/2, 63 days; bromadiolone: t1/2, 17 days; flocoumafen: t1/2, 6 days). The decline of the liver concns of these 3 test chemicals occurred in a "bi-exponential manner". The second t1/2's were estimated to be 282, 318, and 159 days for brodifacoum, bromadiolone, and flocoumafen, respectively. In general, oral admin of any of these 3 chemicals would result in substantial retention of the chemical in the liver for a very long time.

USEPA; Reregistration Eligibility Decision Document - Rodenticide Cluster. Washington, DC: USEPA, Off Pest Prog. USEPA 738-R-98-007, p.38 July 1998. Available from, as of March 17, 2003: https://www.epa.gov/pesticides/reregistration/status.htm


4.3 Metabolism/Metabolites

/The goal of this study is/ to assess the rate and extent of ruminal degradation of warfarin, chlorophacinone, and bromadiolone in vitro and determine the oral availability and clinical and hemostatic effects of each anticoagulant rodenticide in adult sheep... Samples of ruminal fluid were incubated with each of the anticoagulants to assess the kinetics of ruminal degradation over 24 hours. To determine the plasma kinetics of the anticoagulants, each /of 3 Texel/ sheep received each of the anticoagulants IV or via a rumen implanted cannula at 2-month intervals (3 rodenticide exposures/sheep). At intervals during a 240- to 360- hour period after treatment, prothrombin time (PT) was measured, plasma anticoagulant concentration was assessed, and clinical signs of rodenticide poisoning were monitored. In plasma and rumen extracts, anticoagulant concentrations were determined via high-performance liquid chromatography. In the rumen extracts, anticoagulants were slightly degraded (< 15%) over 24 hours. In vivo, oral availability of warfarin, chlorophacinone, and bromadiolone was estimated at 79%, 92%, and 88%, respectively. Although maximum PT was 80 seconds after chlorophacinone and bromadiolone treatments, no clinical signs of toxicosis were detected; PT returned to baseline values within 2 weeks. In sheep, warfarin, chlorophacinone, and bromadiolone were not degraded in the rumen but their bioavailabilities were high after oral administration; the kinetics of these compounds in sheep and other mammals are quite similar. These data suggest that the lack of susceptibility of ruminants to these anticoagulant rodenticides cannot be explained by either ruminal degradation or the specific toxicokinetics of these anticoagulants.

PMID:16454646 Berny PJ; Am J Vet Res. 67(2):363-71 (2006).


Warfarin is a widely used anticoagulant in the treatment and prevention of thrombosis, in the treatment for chronic atrial fibrillation, mechanical valves, pulmonary embolism, and dilated cardiomyopathy. It is tasteless and colorless, was used as a poison, and is still marketed as a pesticide against rats and mice. Several long-acting warfarin derivatives-superwarfarin anticoagulants-such as brodifacoum, diphenadione, chlorophacinone, bromadiolone, are used as pesticides and can produce profound and prolonged anticoagulation. Several factors increase the risk of warfarin toxicity. However, polymorphisms in cytochrome P450 genes and drug interactions account for most of the risk for toxicity complications. Each person is unique in their degree of susceptibility to toxic agents. The toxicity interpretation and the health risk of most toxic substances are a subject of uncertainty. Genetically determined low metabolic capacity in an individual can dramatically alter the toxin and metabolite levels from those normally expected, which is crucial for drugs with a narrow therapeutic index, like warfarin. Personalized approaches in interpretation have the potential to remove some of the scientific uncertainties in toxicity cases.

PMID:22069565 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3153177 Piatkov I et al; Toxins (Basel). 2(11):2584-92 (2010).


Anticoagulant resistance in Norway rats, Rattus norvegicus (Berk.), has been suggested to be conferred by mutations in the VKORC1 gene, encoding the target protein of anticoagulant rodenticides. Other factors, e.g. pharmacokinetics, may also contribute to resistance, however. To examine the involvement of pharmacokinetics in bromadiolone resistance in male and female rats, liver expression profiles of seven cytochrome P450 genes from a Danish bromadiolone-resistant rat strain (with an Y139C-VKORC1 mutation) were compared with profiles from an anticoagulant-susceptible strain. In the presence of bromadiolone, the Cyp2e1, Cyp2c13, Cyp3a2 and Cyp3a3 genes were significantly overexpressed, while Cyp2c12 expression was suppressed in resistant female rats compared with susceptible females. Relative to susceptible males, resistant males showed significant overexpression of the Cyp2a1, Cyp2e1, Cyp3a2 and Cyp3a3 genes. On exposure to bromadiolone, females had higher Cyp2e1 expression than males, which possibly explains why female rats are generally more tolerant to anticoagulants than male rats. Results suggest that bromadiolone resistance in a Danish strain of Norway rats involves enhanced anticoagulant metabolism catalyzed by cytochrome P450-2e1, -3a2 and -3a3. This pharmacokinetically based bromadiolone resistance is to some extent sex differentiated, as female resistance furthermore seems to involve overexpression of cytochrome P450-2c13 and suppression of P450-2c12, whereas male resistance appears to involve P450-2a1 overexpression.

PMID:18080289 Markussen MD et al; Pest Manag Sci. 64(3):239-48 (2008).


Bromadiolone, brodifacoum and coumatetralyl were also found in rats as unchanged parent compounds... .

WHO; Environ Health Criteria 175: Anticoagulant Rodenticides p.50 (1995)


Long-acting compounds are metabolized by hepatic cytochrome P-450 isozymes (e.g., CYP3A4). /Long-Acting Rodenticides/

Dart, R.C. (ed). Medical Toxicology. Third Edition, Lippincott Williams & Wilkins. Philadelphia, PA. 2004., p. 1498


4.4 Biological Half-Life

... Poisoning in a 40-year old female who ... ingested ... equivalent to 8.5 mg bromadiolone (0.17 mg/kg body weight), four days prior to admission. ... The first plasma bromadiolone level (5 days post-ingestion) was 92 ng/mL. Serial measurement of plasma bromadiolone levels confirmed the diagnosis and demonstrated that bromadiolone obeys the elimination kinetic of a two-compartment model with a rapid, fairly steep decline phase (half-life 3.5 days) followed by a slower termination phase (half-life 24 days). ...

PMID:19238731 Lo VM et al; Clin Toxicol (Phila). 46(8):703-10 (2008).


Rats (Rattus norvegicus) dosed orally with the rodenticide bromadiolone (0.8 and 3 mg/kg) were sacrificed in groups of 4 rats at various times up to 97 hr after administration. Bromadiolone was assayed in plasma, liver and kidney. ... The compound disappeared slowly from the organism with a half-life of 25.7 hr for the 0.8 mg/kg dose and 57.5 hr for the 3 mg/kg. ...

PMID:3444841 Kamil N; Pharmacol Res Commun 19 (11): 767-76 (1987)


Half-life in blood /of rats/ 1.0 to 2.4 days... Half-life in liver /of rats/ 170-318 days /From table/.

California Department of Pesticide Regulation; Second Generation Anticoagulant Rodenticide Assessment, June 27, 2013; Available from, as of March 13, 2014: https://www.cdpr.ca.gov/docs/registration/reevaluation/chemicals/brodifacoum_final_assess.pdf


Calculated elimination half-life of 140 hr.

PMID:16803669 Grobosch T et al; J Anal Toxicol. 30(4):281-6 (2006).


The concentrations of bromadiolone in whole blood and plasma in serial samples from a 62-year-old woman were measured. The half-life of bromadiolone in blood was estimated to be about 6 days in the initial phase of elimination and about 10-13 days in the terminal phase.

PMID:18482378 Vindenes V; J Forensic Sci. 53(4):993-6 (2008).


4.5 Mechanism of Action

An anticoagulant inhibiting the formation of prothrombin.

Spencer, E. Y. Guide to the Chemicals Used in Crop Protection. 7th ed. Publication 1093. Research Institute, Agriculture Canada, Ottawa, Canada: Information Canada, 1982., p. 52


Anticoagulant pesticides are used widely in agricultural and urban rodent control. The emergence of warfarin-resistant strains of rats led to the introduction of a new group of anticoagulant rodenticides variously referred to as 'superwarfarins', 'single dose' or 'long-acting'. This group includes the second generation 4-hydroxycoumarins brodifacoum, bromadiolone, difenacoum, flocoumafen and the indanedione derivatives chlorophacinone and diphacinone. Most cases of anticoagulant rodenticide exposure involve young children and, as a consequence, the amounts ingested are almost invariably small. In contrast, intentional ingestion of large quantities of long-acting anticoagulant rodenticides may cause anticoagulation for several weeks or months. Occupational exposure has also been reported. Anticoagulant rodenticides inhibit vitamin K(1)-2,3 epoxide reductase and thus the synthesis of vitamin K and subsequently clotting factors II, VII, IX and X. The greater potency and duration of action of long-acting anticoagulant rodenticides is attributed to their: (i) greater affinity for vitamin K(1)-2,3-epoxide reductase; (ii) ability to disrupt the vitamin K(1)-epoxide cycle at more than one point; (iii) hepatic accumulation; and (iv) unusually long biological half-lives due to high lipid solubility and enterohepatic circulation...

PMID:16499407 Watt BE et al; Toxicol Rev. 24(4):259-69 (2005).


The effects of coumarins and indandiones on prothrombin synthesis and conversion of vitamin k1 2,3-epoxide to vitamin k1 were measured. Results provided evidence for the proposed mechanism of action by preventing regeneration of vitamin k1 from its metabolite. /Coumarins and indandiones/

PMID:864593 REN P ET AL; J PHARMACOL EXP THER 201 (3): 541-6 (1977)


Both 4-hydroxycoumarin derivatives and indandiones (also known as oral anticoagulants) are antagonists of vitamin K. Their use as rodenticides is based on the inhibition of the vitamin K-dependent step in the synthesis of a number of blood coagulation factors. The vitamin K-dependent proteins ...in the coagulation cascade... are the procoagulant factors II (prothrombin), VII (proconvertin), IX (Christmas factor) and X (Stuart-Prower factor), and the coagulation-inhibiting proteins C and S. All these proteins are synthesized in the liver. Before they are released into the circulation the various precursor proteins undergo substantial (intracellular) post-translational modification. Vitamin K functions as a co-enzyme in one of these modifications, namely the carboxylation at well-defined positions of 10-12 glutamate residues into gamma-carboxyglutamate (Gla). The presence of these Gla residues is essential for the procoagulant activity of the various coagulations factors. Vitamin K hydroquinone (KH2) is the active co-enzyme, and its oxidation to vitamin K 2,3-epoxide (KO) provides the energy required for the carboxylation reaction. The epoxide is than recycled in two reduction steps mediated by the enzyme KO reductase... . The latter enzyme is the target enzyme for coumarin anticoagulants. Their blocking of the KO reductase leads to a rapid exhaustion of the supply of KH2, and thus to an effective prevention of the formation of Gla residues. This leads to an accumulation of non-carboxylated coagulation factor precursors in the liver. In some cases these precursors are processed further without being carboxylated, and (depending on the species) may appear in the circulation. At that stage the under-carboxylated proteins are designated as descarboxy coagulation factors. Normal coagulation factors circulate in the form of zymogens, which can only participate in the coagulation cascade after being activated by limited proteolytic degradation. Descarboxy coagulation factors have no procoagulant activity (i.e. they cannot be activated) and neither they can be converted into the active zymogens by vitamin K action. Whereas in anticoagulated humans high levels of circulating descarboxy coagulation factors are detectable, these levels are negligible in warfarin-treated rats and mice. /Anticoagulant rodenticides/

WHO; Environ Health Criteria 175: Anticoagulant Rodenticides p.46 (1995)


For more Mechanism of Action (Complete) data for BROMADIOLONE (6 total), please visit the HSDB record page.


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