title: (+)-3,11-Dioxoandrost-4-ene-17 beta-carboxylic acid: catemeric hydrogen bonding in a steroidal keto acid.
abstract: The title keto acid, C(20)H(26)O(4), forms carboxyl-to-ketone hydrogen-bonding catemers [O...O = 2.653 (5) A and O[bond]H...O = 172 (5) degrees ], linking translationally related molecules via the A-ring ketone. The two molecules in the cell form two parallel counter-directional chains, screw-related in b. A total of four intermolecular C[bond]H...O[double bond]C close contacts was found, involving both ketone functions.
authors.affiliation: Carl A. Olson Memorial Laboratories, Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
authors.forename: Jacob M
authors.initials: JM
authors.lastname: Newman
authors.forename: Roger A
authors.initials: RA
authors.lastname: Lalancette
authors.forename: Hugh W
authors.initials: HW
authors.lastname: Thompson