JOURNAL OF CHEMICAL RESEARCH, no.8, pp.478-482, 1999 (SCI-Expanded)
The X-ray crystal structures of 6 beta-toluene-p-sulfonyloxymethyl-5 beta-hydroxy-B-norandrostane-3,17-dione (7) and 6 beta-methoxycarbonyl-3 beta,5 beta-dihydroxy-B-norandrostan-17-one (8) reveal that ring A exists in a twisted boat form in these 5 beta-B-norandrostanes.