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Cyromazine
Also known as: 66215-27-8, Larvadex, Vetrazin, Neporex, Cyromazin, Trigard
Molecular Formula
C6H10N6
Molecular Weight
166.18  g/mol
InChI Key
LVQDKIWDGQRHTE-UHFFFAOYSA-N
FDA UNII
CA49Y29RA9

1 2D Structure

Cyromazine

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-N-cyclopropyl-1,3,5-triazine-2,4,6-triamine
2.1.2 InChI
InChI=1S/C6H10N6/c7-4-10-5(8)12-6(11-4)9-3-1-2-3/h3H,1-2H2,(H5,7,8,9,10,11,12)
2.1.3 InChI Key
LVQDKIWDGQRHTE-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1CC1NC2=NC(=NC(=N2)N)N
2.2 Other Identifiers
2.2.1 UNII
CA49Y29RA9
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 2-cyclopropylamino-4,6-diamino-s-triazine

2. Cga 72662

3. Cga-72662

4. Cyromazin

5. Cyromazine Dihydrochloride

6. Larvadex

7. N-cyclopropyl-1,3,5-triazine-2,4,6-triamine

8. N-cyclopropylmelamine

9. Neporex

10. Vetrazin

2.3.2 Depositor-Supplied Synonyms

1. 66215-27-8

2. Larvadex

3. Vetrazin

4. Neporex

5. Cyromazin

6. Trigard

7. Cyclopropylmelamine

8. Cypromazine

9. Vetrazine

10. Citation

11. N-cyclopropyl-1,3,5-triazine-2,4,6-triamine

12. Azimethiphos

13. Cga 72662

14. 2-cyclopropylamino-4,6-diamino-s-triazine

15. Armor

16. N-cyclopropylmelamine

17. Vetrazin (pesticide)

18. 1,3,5-triazine-2,4,6-triamine, N-cyclopropyl-

19. Cyromazinum

20. Ciromazina

21. Larvadex Premix

22. N-cyclopropyl-2,4,6-triamino-1,3,5-triazine

23. N2-cyclopropyl-1,3,5-triazine-2,4,6-triamine

24. Oms-2014

25. 2-n-cyclopropyl-1,3,5-triazine-2,4,6-triamine

26. 2,4-diamino-6-(cyclopropylamino)-s-triazine

27. Cga-72662

28. Neporex (tn)

29. Cyromazine [ansi:bsi:iso]

30. Ai3-52713

31. Cyromazin;cga-72662

32. Nsc-759268

33. Ca49y29ra9

34. Chebi:30260

35. Cyromazine (inn)

36. N~2~-cyclopropyl-1,3,5-triazine-2,4,6-triamine

37. N-cyclopropyltriazine-2,4,6-triamine

38. Diamino-6-(cyclopropylamino)-s-triazine

39. Ncgc00163803-03

40. Cyromazine [inn]

41. Dsstox_cid_3999

42. Cyclopropyl-1,3,5-triazine-2,4,6-triamine

43. Dsstox_rid_77253

44. Dsstox_gsid_23999

45. N(2)-cyclopropyl-1,3,5-triazine-2,4,6-triamine

46. Caswell No. 167b

47. Cyromazine [ban:inn]

48. Cyromazinum [inn-latin]

49. Ciromazina [inn-spanish]

50. Cas-66215-27-8

51. N2-cyclopropylmelamine

52. Hsdb 6602

53. Cyromazine D4 (cyclopropyl-2,2,3,3 D4)

54. 4-n-cyclopropyl-1,3,5-triazine-2,4,6-triamine

55. Einecs 266-257-8

56. Brn 0882879

57. Unii-ca49y29ra9

58. Cyromazine [usp:inn:ban]

59. Neoprex

60. N-cyclopropyl-1,3,5-triazin-2,4,6-triamine

61. Ax3

62. Mfcd00078650

63. Cyromazine [mi]

64. Cyromazine (usp/inn)

65. Cyromazine [iso]

66. Cyromazine [hsdb]

67. Cyromazine [mart.]

68. 2,4-diamino-6-cyclopropylamino-1,3,5-triazine

69. Cyromazine [usp-rs]

70. Schembl27231

71. 2,4-diamino-6-(cyclopropylamino)-1,3,5-triazine

72. 2,4-diamino-6-(cyclopropylamino)-s-triazine (8ci)

73. Zinc1239

74. Chembl1231107

75. Dtxsid6023999

76. Cyromazine (n-clopropyl-1,3,5-triazine-2,4,6-triamine)

77. Cyromazine [usp Impurity]

78. Hms3264k09

79. Hms3652n03

80. Pharmakon1600-01505903

81. Bcp13527

82. Hy-b1331

83. Tox21_112074

84. Tox21_201846

85. Tox21_300784

86. Nsc759268

87. S4167

88. Akos007930524

89. Cyromazine 100 Microg/ml In Methanol

90. Tox21_112074_1

91. Ac-6858

92. Ccg-213992

93. Cs-4864

94. Nsc 759268

95. Cyromazine 1000 Microg/ml In Methanol

96. Cyromazine-(cyclopropyl-2,2,3,3-d4)

97. Ncgc00163803-01

98. Ncgc00163803-02

99. Ncgc00163803-04

100. Ncgc00163803-05

101. Ncgc00163803-06

102. Ncgc00254688-01

103. Ncgc00259395-01

104. 2cyclopropylamino-4,6-diamino-s-triazine

105. As-12700

106. Cyromazine 100 Microg/ml In Acetonitrile

107. 2,4-diamino-6-cyclopropylamino-s-triazine

108. Db-054884

109. Ft-0603144

110. Ft-0665421

111. Sw220183-1

112. Cyromazin, Pestanal(r), Analytical Standard

113. A16473

114. D07767

115. D89506

116. Ab01563373_01

117. Ab01563373_02

118. 215c278

119. A835367

120. Q412423

121. Sr-01000944274

122. Q-200914

123. Sr-01000944274-1

124. N-cyclopropyl-1,3,5-triazine-2,4,6-triamine, 9ci

125. N-cyclopropyl-2,4,6-triamino-1,3,5-triazine, 97%

126. Cyromazin (n-cyclopropyl- 1,3,5-triazine-2,4,6-triamine)

127. Cyromazine, United States Pharmacopeia (usp) Reference Standard

128. N2-cyclopropyl-1,3,5-triazine-2,4,6-triamine;n-cyclopropyl-2,4,6-triamino-1,3,5-triazine

2.4 Create Date
2004-09-16
3 Chemical and Physical Properties
Molecular Weight 166.18 g/mol
Molecular Formula C6H10N6
XLogP3-0.2
Hydrogen Bond Donor Count3
Hydrogen Bond Acceptor Count6
Rotatable Bond Count2
Exact Mass166.09669434 g/mol
Monoisotopic Mass166.09669434 g/mol
Topological Polar Surface Area103 Ų
Heavy Atom Count12
Formal Charge0
Complexity148
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

MEDICATION (VET): ectoparasiticide

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 466


MEDICATION (VET): Cyromazine, a triazine derivative, is effective against blowfly larvae on sheep and lambs and also against other Diptera such as houseflies and mosquitos. At recommended dose rates, cyromazine shows only limited activity against established strikes and must therefore be used preventively. Blowflies usually lay eggs on damp fleece of treated sheep. Although larvae are able to hatch, the young larvae immediately come into contact with cyromazine, which prevents the molt to second instars. The efficacy of a pour-on preparation of cyromazine does not depend on factors such as weather, fleece length, and whether the fleece is wet or dry. Control can be maintained for up to 13 wk after a single pour-on application, or longer if cyromazine is applied by dip or shower.

Kahn, C.M. (Ed.); The Merck Veterinary Manual 9th ed. Merck & Co. Whitehouse Station, NJ. 2005, p. 2163


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Insecticides

Pesticides designed to control insects that are harmful to man. The insects may be directly harmful, as those acting as disease vectors, or indirectly harmful, as destroyers of crops, food products, or textile fabrics. (See all compounds classified as Insecticides.)


5.2 Absorption, Distribution and Excretion

Dermal Absorption /in rats/ ... at 10 hrs = 13 %. Cyromazine /was/ apparently rapidly absorbed into the skin in an inverse dose related manner. The absorption into the skin is followed by a slower release into the body. The main route of excretion is apparently by the urine. There is no evidence that the compound is sequestered in the skin. Mean absorption based on blood, urinary/ fecal excretion, and carcass, ranged from 0.6 to 7% for animals sacrificed at the end of the exposure periods. For animals exposed for 10 and 24 hours and followed for 48 hours post-exposure, mean absorption ranged from 8 to 14.5%. Total radioactivity absorbed generally decreased as dose increased indicating saturation of absorption with increasing dose. Amounts remaining in/on the skin at termination ranged from 4.5% (10 mg dose/2 hr exposure) to 24% ( 0.1 mg dose/24 hr exposure). The majority of the absorbed radioactivity was found in the urine and carcass. Most of the unabsorbed radioactivity was found in the skin washes from each dose/ duration. /In another portion of the same study in rats/ absorption at 10 hrs = 10%. Mean total recoveries of applied radioactivity from all dose groups ranged from 85 to 101%. Mean absorption based on blood, urinary/ fecal excretion, and carcass, ranged from 2% to 11%. Total radioactivity absorbed generally increased with increasing exposure time but decreased with increasing dose indicating saturation of penetration with increasing dose. The majority of the absorbed radioactivity was found in the urine and carcass. Most of the unabsorbed radioactivity was found in the skin washes from each dose/duration (35-90%). However, based on measurements of skin absorption, a significant amount of radioactive dose was also found in the skin itself (9-40%). Mean absorption with inclusion of radioactivity in dissolved skin ranged from 10 to 45%. The ratio of the amount of radioactive dose in the skin wash to the radioactivity in the skin itself decreased with time indicating penetration into the subsurface of the skin with time after treatment.

USEPA; Rules and Regulations. Cyromazine; Pesticide Tolerance. 68 FR 55261 (September 24, 2003)


Cyromazine was well absorbed after oral administration /to rats/. Excretion was rapid at the dose (3 mg/kg), but an apparent delay in excretion occurred at the high dose (300 mg/kg). Fecal elimination was equivalent among dose groups except the high dose males, where a greater percentage was eliminated by this route. The origin of fecal radioactivity was via biliary elimination. Residual radioactivity in tissues was minimal in all dose groups. Urinary and fecal metabolites of 14C-cyromazine were isolated and identified by TLC, HPLC, and GC/MS. The major compounds were the N-dealkylated product melamine, hydroxycyromazine, and unmetabolized cyromazine identified

USEPA; Rules and Regulations. Cyromazine; Pesticide Tolerance. 68 FR 55261 (September 24, 2003)


A single dose of 0.5 mg/kg bw of 14C-cyromazine (uniformly triazine ring labeled) was given orally to two male and one female Charles River white rats (not further identified). By 72 hours after dosing, 95% of the administered dose had been excreted in urine, essentially all within the first 24 hours. About 3% was excreted in feces, again predominantly in the first 24 hours. Negligible amounts were excreted as volatiles or CO2 in another two males and one female given the same dose. Tissue residues were below the level of detection except in liver; however, liver levels were too low to permit accurate quantitation (about 0.007 ppm).

Joint FAO/WHO Meeting on Pesticide Residues in Food. Evaluations (1990) Toxicology. Cyromazine (September 1990). Available from, as of June 8, 2007: https://www.inchem.org/documents/jmpr/jmpmono/v90pr01.htm


Two chickens (strain not indicated) were given daily oral doses of 14C-cyromazine (uniformly triazine ring labeled) of 0.75 mg/hen/day by capsule for seven days. By 24 hours after the last dose 99.1% of the administered radioactivity had been recovered in the excreta with essentially none in volatiles and CO2. Both egg whites and egg yolks contained about 0.12-0.15 ppm consistently. Tissue levels were: byproducts (i.e. head and feet) 0.047 ppm test material equivalents; reproductive tract 0.047 ppm; liver 0.032 ppm; all other tissues 0.008-0.019 ppm.

Joint FAO/WHO Meeting on Pesticide Residues in Food. Evaluations (1990) Toxicology. Cyromazine (September 1990). Available from, as of June 8, 2007: https://www.inchem.org/documents/jmpr/jmpmono/v90pr01.htm


For more Absorption, Distribution and Excretion (Complete) data for CYROMAZINE (10 total), please visit the HSDB record page.


5.3 Metabolism/Metabolites

Cyromazine was well absorbed after oral administration /to rats/. ... Urinary and fecal metabolites of 14C-cyromazine were isolated and identified by TLC, HPLC, and GC/MS. The major compounds were the N-dealkylated product melamine, hydroxycyromazine, and unmetabolized cyromazine identified.

USEPA; Rules and Regulations. Cyromazine; Pesticide Tolerance. 68 FR 55261 (September 24, 2003)


Urine from a female rat given a single oral dose of 14C-cyromazine (uniformly triazine ring labeled) of 0.5 mg/kg bw was analyzed using TLC and a cation exchange column chromatography system. With both systems the majority of the urinary radioactivity was determined to be in the form of unchanged parent compound. Unchanged parent compound in urine accounted for about 80% of the administered dose. Three metabolites were detected with each system and were presumed to be the same compounds. These metabolites accounted for 2.2-3.2%, 3.0-5.5%, and 4.6-5.3% of the administered dose, respectively, but no identification was made. Fecal material from a male rat given the same dose as the above female was found to contain little unchanged parent compound: <0.1% of the administered dose. The same three metabolites as observed in urine were found and represented 0.1, 0.1 and 4.1% of the administered dose, respectively.

Joint FAO/WHO Meeting on Pesticide Residues in Food. Evaluations (1990) Toxicology. Cyromazine (September 1990). Available from, as of June 8, 2007: https://www.inchem.org/documents/jmpr/jmpmono/v90pr01.htm


One male and one female albino Sprague-Dawley rats were given diet containing 3000 ppm of 14C-cyromazine for 10 days. In the male the liver was found to contain 31.3 ppm cyromazine and 0.96 ppm melamine and the kidney 62.4 ppm cyromazine and 1.3 ppm melamine. In the female liver residues were 13.2 ppm and 0.51 ppm and kidney residues 22.2 and 0.68 ppm of cyromazine and melamine, respectively. This study indicated that there was some conversion of cyromazine to melamine in vivo.

Joint FAO/WHO Meeting on Pesticide Residues in Food. Evaluations (1990) Toxicology. Cyromazine (September 1990). Available from, as of June 8, 2007: https://www.inchem.org/documents/jmpr/jmpmono/v90pr01.htm


Urine from male and female monkeys (Macaca fasicicula) given single oral doses of 14C-cyromazine (uniformly triazine ring labeled) of 0.05 or 0.5 mg/kg bw by capsule was found to have the majority of the radioactivity present in the form of unchanged parent compound. Regardless of dose 93.6-96.1% of the urinary radioactivity was present as unchanged cyromazine. Additionally, 2.9-6.4% of the radioactivity as identified as melamine ... In a second study with the same strain of monkey given the same dose levels, urine collected during the first 24 hours after dosing had 95-100% of the recovered radioactivity in the form of unchanged cyromazine. In one male dosed at 0.05 mg/kg bw, no melamine was detected in the urine. In one female at 0.05 mg/kg bw and one monkey of each sex given 0.5 mg/kg bw 3.0-3.9% of the urinary radioactivity was in the form of melamine.

Joint FAO/WHO Meeting on Pesticide Residues in Food. Evaluations (1990) Toxicology. Cyromazine (September 1990). Available from, as of June 8, 2007: https://www.inchem.org/documents/jmpr/jmpmono/v90pr01.htm


For more Metabolism/Metabolites (Complete) data for CYROMAZINE (9 total), please visit the HSDB record page.


5.4 Mechanism of Action

Insect growth regulator with contact action, which interferes with moulting and pupation. When used on plants, action is systemic.

Hartley, D. and H. Kidd (eds.). The Agrochemicals Handbook. 2nd ed. Lechworth, Herts, England: The Royal Society of Chemistry, 1987., p. A607/Aug 87


Cyromazine is an effective insecticide used to control dipteran insects. Its precise mode of action is yet to be determined, although it has been suggested that it interferes with the hormone system, sclerotization of the cuticle, or nucleic acid metabolism. To understand the way in which cyromazine acts, /the authors/ positionally cloned a cyromazine resistance gene from Drosophila melanogaster. Six cyromazine resistance alleles had previously been generated by ethyl methanasulfonate treatment. Two of these failed to complement each other and here /the authors/ identify them as having independent non-sense mutations in CG32743, which is an ortholog of Smg1 of worms and mammals and encodes a phosphatidylinositol kinase-like kinase (PIKK). RNAi experiments confirm that cyromazine resistance can be achieved by knocking down CG32743. These are the first cyromazine resistant mutations identified at the nucleotide level. In mammals Smg1 phosphorylates P53 in response to DNA damage. This finding supports the hypothesis that cyromazine interferes with nucleic acid metabolism.

PMID:16640728 Chen Z et al; Insect Mol Biol 15 (2): 181-6 (2006)


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