Title: Enterolactone
CAS Registry Number: 78473-71-9
CAS Name: (3R,4R)-rel-Dihydro-3,4-bis[(3-hydroxyphenyl)methyl]-2(3H)-furanone
Additional Names: trans-(±)-2,3-bis(3¢-hydroxybenzyl)-g-butyrolactone; HPMF; HBBL
Manufacturers' Codes: compd 180/442
Molecular Formula: C18H18O4
Molecular Weight: 298.33
Percent Composition: C 72.47%, H 6.08%, O 21.45%
Literature References: Phenolic compound having 2,3-dibenzylbutane skeleton. First lignan, q.v., found in animal species. Determn in female urine from humans, vervet monkeys and characterization: S. R. Stitch et al., Nature 287, 738 (1980); K. D. R. Setchell et al., ibid. 740. Structure determn by GC-MS: eidem, Biochem. J. 197, 447 (1981); eidem, Biomed. Mass Spectrom. 10, 227 (1983). 1H-NMR, X-ray crystal structure: G. Cooley et al., J. Chem. Soc. Perkin Trans. 1 1984, 489. Synthesis: M. B. Groen, J. Leemhuis, Tetrahedron Lett. 21, 5043 (1980); G. Cooley et al., ibid. 22, 349 (1981); A. Pelter et al., ibid. 1549; P. A. Ganeshpure, R. Stevenson, Chem. Ind. (London) 1981, 778; A. Pelter et al., J. Chem. Soc. Perkin Trans. 1 1983, 643. Lignan excretion peaks during luteal phase of menstrual cycle: K. D. R. Setchell et al., J. Steroid Biochem. 12, 375 (1980). Excretion as glucuronide conjugate: M. Axelson, K. D. R. Setchell, FEBS Lett. 122, 49 (1980). Biosynthesis by intestinal bacteria: eidem, ibid. 123, 337 (1981). Effect of diet on lignan excretion: H. Aldercreutz et al., Med. Biol. 59, 337 (1981).
Properties: Gum, mp 141-143°. uv max (ethanol): 227, 261 nm (log e 4.66, 4.64).
Melting point: mp 141-143°
Absorption maximum: uv max (ethanol): 227, 261 nm (log e 4.66, 4.64)
Enteromycin Entprol Enviomycin Enviroxime Eosine I Bluish

Abbreviations ENL
CAS number 78473-71-9 YesY
PubChem 10685477
Jmol-3D images Image 1
Molecular formula C18H18O4
Molar mass 298.33 g mol−1
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Enterolactone is a lignan formed by the action of intestinal bacteria on lignan precursors found in plants[1] such as sesamin.[2]

It acts as a phytoestrogen.[3]