title: rac-(1S,2R)-Diethyl 6-hydr-oxy-1-(4-methoxy-phen-yl)-3-oxo-2,3-di-hydro-1H-benzo[f]chromen-2-yl]-phospho-nate.
abstract: In the title compound, C(24)H(25)O(7)P, the δ-valerolactonyl ring exists in a distorted screw-boat conformation with the diethoxy-phosphoryl substituent occupying an axial position. The latter adopts an almost syn-periplanar conformation around the P-C bond. The mol-ecules form centrosymmetric dimers connected by O-H⋯O hydrogen bonds.
authors.forename: Jakub
authors.initials: J
authors.lastname: Wojciechowski
authors.forename: Henryk
authors.initials: H
authors.lastname: Krawczyk
authors.forename: Lukasz
authors.initials: L
authors.lastname: Albrecht
authors.forename: Wojciech M
authors.initials: WM
authors.lastname: Wolf