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Tox21_300282
Also known as: 77-09-8, Phthalimetten, Euchessina, Phthalin, Espotabs, Phenolax
Molecular Formula
C20H14O4
Molecular Weight
318.3  g/mol
InChI Key
KJFMBFZCATUALV-UHFFFAOYSA-N
FDA UNII
6QK969R2IF

An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
1 2D Structure

Tox21_300282

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one
2.1.2 InChI
InChI=1S/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H
2.1.3 InChI Key
KJFMBFZCATUALV-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C2C(=C1)C(=O)OC2(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O
2.2 Other Identifiers
2.2.1 UNII
6QK969R2IF
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Ap-la-day

2. Ex-lax

3. Feen-a-mint

4. Laxatone

5. Laxettes

6. Modane

7. Thalinol

2.3.2 Depositor-Supplied Synonyms

1. 77-09-8

2. Phthalimetten

3. Euchessina

4. Phthalin

5. Espotabs

6. Phenolax

7. Koprol

8. Laxogen

9. Trilax

10. Purga

11. Spulmako-lax

12. Feen-a-mint Gum

13. Purgen

14. 3,3-bis(4-hydroxyphenyl)phthalide

15. 3,3-bis(4-hydroxyphenyl)-1(3h)-isobenzofuranone

16. Alophen

17. Doxidan

18. Dihydroxyphthalophenone

19. Phillips Gelcaps

20. 1(3h)-isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-

21. 3,3-bis(p-hydroxyphenyl)phthalide

22. Fenolftalein

23. Phenolphtaleine

24. Phenophthalein

25. 3,3-bis(4-hydroxyphenyl)isobenzofuran-1(3h)-one

26. 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one

27. Nci-c55798

28. Feen-a-mint Laxative Mints

29. 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1(3h)-one

30. Nsc 10464

31. Component Of Agoral

32. 3,3-bis(4-hydroxyphenyl)-1,3-dihydro-2-benzofuran-1-one

33. Phenolphthalein,white

34. Phthalide 3,3,-bis(p-hydroxyphenyl)-

35. Mfcd00005913

36. Chembl63857

37. Mls000069592

38. 6qk969r2if

39. Correctol

40. Dtxsid0021125

41. Medilax

42. Chebi:34914

43. Colax

44. Laxin

45. Femilax

46. Lax-pills

47. Nsc-10464

48. Evac-q-kwik

49. Evac-q-kit

50. Evac-u-gen

51. Component Of Correctol

52. Phenolphthalein (inn)

53. Ncgc00018200-07

54. Smr000059015

55. Agoral

56. Fenolftalein [czech]

57. Dsstox_cid_1125

58. Dsstox_rid_75956

59. Dsstox_gsid_21125

60. Phenolphthalein [inn]

61. Component Of Feen-a-mint Pills

62. Fenolftaleina [inn-spanish]

63. Phenolphtaleine [inn-french]

64. Phenolphthaleinum [inn-latin]

65. Fenolftaleina

66. Phenolphthaleinum

67. Phthalide 3,-bis(p-hydroxyphenyl)-

68. Alpha-di(p-hydroxyphenyl)phthalide

69. Cas-77-09-8

70. Phenolphthalein Solution, Alcoholic 1.0%

71. Ccris 6266

72. Wln: T56 Bvo Dhj D- D-/r Dq 2

73. Hsdb 4161

74. 1(3h)-isobenzofuranone,3-bis(4-hydroxyphenyl)-

75. 3, 3-bis(p-hydroxyphenyl)-1(3h)-isobenzofuranone

76. Einecs 201-004-7

77. Brn 0284423

78. Phenolphtalein

79. Unii-6qk969r2if

80. Ai3-09081

81. Phenolphthalein [usp:inn:ban]

82. Fgt

83. Doxan (salt/mix)

84. Agoral (salt/mix)

85. Modane (tn)

86. Phenolphthalein,(s)

87. Laxcaps (salt/mix)

88. Phenolphthalein,yellow

89. Yellow Phenolphthalein

90. Phenolphthalein Solution

91. Spectrum_001077

92. Opera_id_1337

93. Spectrum2_001279

94. Spectrum3_000888

95. Spectrum4_000982

96. Spectrum5_001268

97. Modane Plus (salt/mix)

98. 3,3-bis(4-hydroxyphenyl)isobenzofuran-1-one

99. Ec 201-004-7

100. Phenolphthalein Acs Reagent

101. Phenolphthalein Solution R1

102. Phenolphthalin [mi]

103. Cid_4764

104. Alpha-(p-hydroxyphenyl)-alpha-(4-oxo-2,5-cyclohexadien-1-ylidene)-o-toluic Acid

105. Phenolphthalein [mi]

106. Phenolphthalein, Acs Reagent

107. Schembl27670

108. Bspbio_002518

109. Kbiogr_001383

110. Kbioss_001557

111. Phenolphthalein, Ph Indicator

112. Phenolphthalein, White

113. 5-18-04-00188 (beilstein Handbook Reference)

114. Mls001148397

115. Bidd:er0202

116. Divk1c_000929

117. Phenolphthalein [hsdb]

118. Phenolphthalein [iarc]

119. Phenolphthalein [inci]

120. Spectrum1500480

121. Phenolphthalein Paper, Dab 6

122. Spbio_001278

123. Phenolphthalein [vandf]

124. 3,3-bis(4-hydroxyphenyl)-3-hydroisobenzofuran-1-one

125. Phenolphthalein [mart.]

126. Phenpolphthalein [vandf]

127. Phenolphthalein [who-dd]

128. Bcbcmap01_000174

129. Hms502o11

130. Kbio1_000929

131. Kbio2_001557

132. Kbio2_004125

133. Kbio2_006693

134. Kbio3_001776

135. Phenolphthalein Solution, 0.1 N

136. Ninds_000929

137. Hms1920h04

138. Hms2091p06

139. Hms2236i09

140. Hms3374p06

141. Pharmakon1600-01500480

142. Component Of Correctol (salt/mix)

143. Amy37148

144. Hy-d0211

145. Nsc10464

146. Zinc3831317

147. Phenolphthalein, P.a., Acs Reagent

148. Tox21_110838

149. Tox21_202219

150. Tox21_300282

151. Bbl002030

152. Bdbm50077844

153. Ccg-39112

154. Nsc215214

155. Nsc757271

156. Phenolphthalein Ph Indicator Solution

157. Phenolphthalein,white [vandf]

158. S5395

159. Stk029876

160. Phenolphthalein [ep Monograph]

161. Akos000493033

162. Tox21_110838_1

163. Cs-8152

164. Db04824

165. Nsc-215214

166. Nsc-757271

167. Phenolphthalein, 0.5% W/v In Alcohol

168. Idi1_000929

169. Smp1_000235

170. Ncgc00018200-01

171. Ncgc00018200-02

172. Ncgc00018200-03

173. Ncgc00018200-04

174. Ncgc00018200-05

175. Ncgc00018200-06

176. Ncgc00018200-08

177. Ncgc00018200-09

178. Ncgc00018200-10

179. Ncgc00018200-12

180. Ncgc00023694-03

181. Ncgc00023694-04

182. Ncgc00023694-05

183. Ncgc00023694-06

184. Ncgc00023694-07

185. Ncgc00254039-01

186. Ncgc00259768-01

187. Ac-14431

188. Bp-30100

189. Vs-01000

190. Phenolphthalein 100 Microg/ml In Methanol

191. Sbi-0051481.p003

192. Component Of Feen-a-mint Pills (salt/mix)

193. Eu-0082600

194. Ft-0659094

195. P0094

196. P0700

197. P0701

198. P0702

199. 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-on

200. En300-92962

201. Phenolphthalein, 2% Solution In 95% Ethanol

202. Phenolphthalein, Saj First Grade, >=97.0%

203. .alpha., .alpha.-di(p-hydroxyphenyl)phthalide

204. 3,3-bis (4-hydroxyphenyl)-2-benzofuran-1-on

205. D05456

206. H12020

207. Phenolphthalein, Jis Special Grade, >=98.0%

208. Ab00052070_15

209. Q187921

210. Sr-01000000112

211. Q-201555

212. Sr-01000000112-2

213. 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1(3h)-one #

214. 3,3-bis-(4-hydroxy-phenyl)-3h-isobenzofuran-1-one

215. Brd-k19227686-001-02-0

216. Brd-k19227686-001-12-9

217. Phenolphthalein Solution, 1 % (w/v), Ph 7.8-10.0

218. Z57233591

219. F0921-4309

220. Phenolphthalein (263 Degrees C) Melting Point Standard

221. Phenolphthalein Solution, 0.04 % (w/v), Ph 7.8-10.0

222. Phenolphthalein Solution, 0.1 % (w/v), Ph 7.8-10.0

223. Phenolphthalein Solution, 0.5 Wt. % In Ethanol: Water (1:1)

224. Phenolphthalein, United States Pharmacopeia (usp) Reference Standard

225. Phenolphthalein, Acs Reagent, Reag. Ph. Eur., Indicator, 98-102% (calc. To The Dried Substance), S. No.: 879

226. Phenolphthalein, Puriss., Meets Analytical Specification Of Ph??eur., Bp, 98-101% (calc. To The Dried Substance)

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 318.3 g/mol
Molecular Formula C20H14O4
XLogP33.6
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count4
Rotatable Bond Count2
Exact Mass318.08920892 g/mol
Monoisotopic Mass318.08920892 g/mol
Topological Polar Surface Area66.8 Ų
Heavy Atom Count24
Formal Charge0
Complexity438
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

Cathartics; Indicators and Reagents

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


...Has...been widely employed as cathartic. ... /it/ is avail...in numerous proprietary preparations.

Hardman, J.G., L.E. Limbird, P.B., A.G. Gilman. Goodman and Gilman's The Pharmacological Basis of Therapeutics. 10th ed. New York, NY: McGraw-Hill, 2001., p. 1046


Since ... laxative effects are not usually produced in less than 6 hr after oral administration, they are often taken at bedtime, to produce their effect next morning. Because of adverse effects, use of these agents should be limited to 10 consecutive days. /diphenylmethane derivatives/

Hardman, J.G., L.E. Limbird, P.B., A.G. Gilman. Goodman and Gilman's The Pharmacological Basis of Therapeutics. 10th ed. New York, NY: McGraw-Hill, 2001., p. 1046


(VET): Has been used as a laxative.

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 1300


Cathartic drug in laxatives; acid-base indicator

SRI


4.2 Drug Warning

Use of phenolphthalein by women during breast-feeding may cause diarrhea in their infants.

IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. V76 399 (2000)


Patients should be warned of possible coloring of urine and feces.

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 923


4.3 Drug Indication

Used for over a century as a laxative.


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Indicators and Reagents

Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant and Hackh's Chemical Dictionary, 5th ed, p301, p499) (See all compounds classified as Indicators and Reagents.)


5.2 ATC Code

A - Alimentary tract and metabolism

A06 - Drugs for constipation

A06A - Drugs for constipation

A06AB - Contact laxatives

A06AB04 - Phenolphthalein


5.3 Absorption, Distribution and Excretion

Up to 15% of therapeutic dose of phenolphthalein is absorbed and eliminated by kidney, most of it in conjugated form.

Ellenhorn, M.J., S. Schonwald, G. Ordog, J. Wasserberger. Ellenhorn's Medical Toxicology: Diagnosis and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams and Wilkins, 1997., p. 1011


Urine becomes pink or red if it is sufficiently alkaline (pH 7or more). Some absorbed drug is also exreted in the bile, and the resulting enterohepatic cycle may contribute to prolongation of laxative effect.

Ellenhorn, M.J., S. Schonwald, G. Ordog, J. Wasserberger. Ellenhorn's Medical Toxicology: Diagnosis and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams and Wilkins, 1997., p. 1011


Biliary excretion of metabolites of...phenolphthalein...in rats was shown...to be increased by pre-treatment with hepatic-microsomal-enzyme inducers, and to be decreased by enzyme inhibitors after dosing with parent compound, but no effect was observed after dosing with metabolites.

The Chemical Society. Foreign Compound Metabolism in Mammals. Volume 2: A Review of the Literature Published Between 1970 and 1971. London: The Chemical Society, 1972., p. 436


Phenolphthalein glucuronide (I) excreted more rapidly than phenolphthalein (II) following iv injection, suggesting that uptake of (I) from blood imposes rate limitation which outweighs the lack of conjugation before excretion.

Clark A et al; J PHARM PHARMACOL 30 (6): 382 (1978)


For more Absorption, Distribution and Excretion (Complete) data for PHENOLPHTHALEIN (14 total), please visit the HSDB record page.


5.4 Metabolism/Metabolites

Phenolphthalein that had undergone conjugation, but no unmetabolized phenolphthalein, was excreted into breast milk in concentrations up to 1.0 ug/mL after a single 200-800 mg dose in 22 lactating women. Bowel movements occurred in 16 of the women after the dose, but none of the nursing infants had diarrhea.

Briggs, G.G, R.K. Freeman, S.J. Yaffe. A Reference Guide to Fetal and Neonatal Risk. Drugs in Pregnancy and Lactation. 4th ed. Baltimore, MD: Williams & Wilkins 1994., p. 683


Yields phenolphthalein-beta-d-glucuronide in rat, in mouse. /from table/

Goodwin, B.L. Handbook of Intermediary Metabolism of Aromatic Compounds. New York: Wiley, 1976., p. 8


Phenolphthalein is absorbed in the intestine and is almost completely converted to its glucuronide during extensive first-pass metabolism in the intestinal epithelium and liver via uridine diphosphate glucuronosyltransferase (UDPGT) in rodents and dogs. In guinea-pigs, small amounts of sulfate-conjugated metabolites have been detected in isolated mucosal sheets originating in the jejunum and colon. Fecal excretion is the major route of elimination of phenolphthalein in rats, while in mice both urinary and fecal elimination are important. The metabolites identified in urine and feces are phenolphthalein glucuronide, phenolphthalein sulfate and phenolphthalein hydroxide.

IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. V76 399-400 (2000)


...The major metabolite was PHTH glucuronide. Three minor metabolites were detected. A sulfate conjugate and and a hydroxylated metabolite were identified by comparison of retention times and 1H NMR and/or mass spectra with synthetic standards. A diglucuronide conjugate was tentatively identified. Biliary elimination was extensive in rats (35% of dose within 6 hr); the only product detected in bile was phenolphthalein glucuronide

PMID:9579019 Griffin RJ et al; Toxicol Sci 42 (2): 73-81 (1998)


5.5 Biological Half-Life

Classical compartmental pharmacokinetics model developed to describe systemic blood concentration-time profile of phenolphthalein following single iv bolus injection; used to simulate 24-hr time course of blood concentration. Indication that long t/2 are artifacts of recirculation.

PMID:38070 Colburn W et al; DRUG METAB DISPOS 7 (2): 100 (1979)


5.6 Mechanism of Action

Stimulant drugs alter fluid and electrolyte absorption, producing net intestinal fluid accumulation and laxation. Increased concentrations of cyclic 3'-5'-adenosine monophosphate (CAMP) occurring in clonic mucosal cells may alter the permeability of these cells leading to net fluid accumulation and laxative action. Phenolphthalein also acts directly or reflexly to increase the the activity of the small intestine. Phenolphthalein acts mainly on the colon about 6 hours after ingestion.

Ellenhorn, M.J., S. Schonwald, G. Ordog, J. Wasserberger. Ellenhorn's Medical Toxicology: Diagnosis and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams and Wilkins, 1997., p. 1011


When taken orally, it is thought to be dissolved by intestinal juices and bile and to stimulate intestinal musculature, chiefly that of colon.

Osol, A. and J.E. Hoover, et al. (eds.). Remington's Pharmaceutical Sciences. 15th ed. Easton, Pennsylvania: Mack Publishing Co., 1975., p. 742


Phenolphthalein increased intestinal fluid volume in rat colon in situ, apparently via stimulation of prostaglandin E biosynthesis in colon.

PMID:631275 Beubler E et al; EXPERIENTIA 34 (3): 386 (1978)


Water absorption from intestines of 6 pt with ileostomies and from rats was measured after administration of phenolphthalein. Results indicate that some laxative effects result from inhibition of water absorption in large and small intestines.

PMID:717350 Saunders D et al; AM J DIG DIS 23 (OCT): 909 (1978)


.... A catechol metabolite of PT, hydroxyphenolphthalein (PT-CAT), was recently identified and may be the molecular species responsible for at least part of the toxicity/carcinogenicity of PT. We hypothesize that PT-CAT inhibits the enzyme catechol-O-methyltransferase (COMT) and therefore potentiates genotoxicity by either PT-CAT itself or the endogenous catechol estrogens (CEs) in susceptible tissues. The present studies were conducted to determine the effects of PT treatment and PT-CAT itself on the COMT-mediated metabolism of 4- and 2-hydroxyestradiol both in vitro and in vivo. Female mice were treated with PT (50 mg/kg/d) for 21 days and then euthanized. PT-CAT concentration in urine reached plateau levels by 7 days of exposure. An O-methylated metabolite of PT-CAT was detected in feces. In vitro experiments demonstrated that PT treatment resulted in an increase in free CEs, which are normally cleared by COMT and a concurrent decrease in the capacity of hepatic catechol clearance by COMT. In vitro, PT-CAT was a substrate of COMT, with kinetic properties within the range measured with endogenous substrates. PT-CAT was an extremely potent mixed-type inhibitor of the O-methylation of the catechol estrogens, with 90-300 nM IC50s.

PMID:10637136 Garner CE, et al; Toxicol Appl Pharmacol 162(2): 124-31 (2000)


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