title: 11β,17,21-Trihydr-oxy-6α-methyl-3,20-dioxopregna-1,4-dien-21-yl 3-carboxy-propionate.
abstract: The mol-ecule of the title compound, C(26)H(34)O(8), a prednisolone derivative, contains three six-membered rings (A, B and C) and one five-membered ring (D). Ring A is planar and rings B and C adopt chair conformations, while ring D adopts an envelope conformation with the C atom bonded to the methyl group at the flap. The crystal structure is stabilized by intermolecular O-H⋯O hydrogen bonds.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Xiannong tan street, Beijing 100050, People's Republic of China.
authors.forename: Hui-Mei
authors.initials: HM
authors.lastname: An
authors.forename: Ning-Bo
authors.initials: NB
authors.lastname: Gong
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu