title: 17beta-Ethoxy-3-methoxy-8-isoestra-1,3,5(10)-triene.
abstract: The conformation of the crystal of 17beta-ethoxy-3-methoxy-8-isoestra-1,3,5(10)-triene, C(21)H(30)O(2), (I), has been established and compared with the molecular structure of a typical steroid estrogen 8-iso-analogue, (II). Calculations of distances separating some of the H-atom pairs in (I) and (II) by molecular-mechanical and semi-empirical methods revealed the similarity of the values to the H.H distances obtained from X-ray analysis.
authors.affiliation: Saint Petersburg State University, Department of Chemistry, Universitetskii Prospekt 26, 198504 Saint Petersburg, Russia.
authors.forename: Galina Leonidovna
authors.initials: GL
authors.lastname: Starova
authors.forename: Maxim Sergeevitch
authors.initials: MS
authors.lastname: Egorov
authors.forename: Evgenija Sergeevna
authors.initials: ES
authors.lastname: Vasiljeva
authors.forename: Alexandr Grigorievitch
authors.initials: AG
authors.lastname: Shavva