(1R,3aS,3bS,13aR,13bS,15aR)-13a,15a-dimethyl-1-((R)-6-methylheptan-2-yl)-2,3,3a,3b,13,13a,13b,14,15,15a-decahydro-1H-cyclopenta[5,6]naphtho[1,2-g]tetrazolo[1,5-a]quinoline-11-carbonitrile

3-chloro-2-formylcholesta-2,4-dien-6-one