Synthesis and crystal structure of-(3 R ,5 S ,10 S ,13 S , 14 S ,16 R , E )-3-((4-chlorophenyl)amino)-17-ethylidene-10,13-dimethylhexadecahydro-1 H -cyclopenta a phenanthren-16-ol, C 27 H 38 ClNO | Synapse