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In the title compound, C 21 H 28 N 2 O 5  (systematic name: methyl 1,4a-dimethyl-7-nitro-9-oxo-6-propyl­amino-1,2,3,4,4a,9,10,10a-octa­hydro­phenanthrene-1-carboxyl­ate) the cyclo­hexane ring ( A ) and the central cyclo­hexene ring ( B ) exist at a  trans  ring junction, with the two methyl groups in the axial positions of the six-membered rings. Ring  A  has a chair conformation and ring  B  a half-chair conformation. An intra­molecular N—H⋯O hydrogen bond occurs. The crystal structure is stabilized by inter­molecular C—H⋯O and N—H⋯O inter­actions.

Methyl 7-oxo-12-propylamino-13-nitrodeisopropyldehydroabietate