The X-ray crystal structures of 6β-toluene-p-sulfonyloxymethyl-5β-hydroxy-B-norandrostane-3,17-dione (7) and 6β-methoxycarbonyl-3β,5β-dihydroxy-B-norandrostan-17-one (8) reveal that ring A exists in a twisted boat form in these 5β-B-norandrostanes.
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