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The title compound, C 26 H 37 NO 5 , which was synthesized from monoethano­lamine and maleopimaric acid, consists of two fused and unbridged cyclo­hexane rings. They form a  trans  ring junction with a chair conformation. The two methyl groups are in axial positions. In the crystal, inter­molecular O—H⋯O hydrogen bonds link adjacent mol­ecules into a layer structure. Two C—H⋯O interactions are also present.

acta crystallographica. section e

15-Hydroxyethyl-19-isopropyl-5,9-dimethyl-14,16-dioxo-15-azapentacyclo[10.5.2.01,10.04,9.013,17]nonadec-18-ene-5-carboxylic acid