methyl 12-isopropylamino-13-nitro-7-oxodehydrodeisopropylabietate

methyl (1R,4aS,10aR)-6-bromo-1,4a-dimethyl-7-nitro-9-oxo-1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carboxylate