6677-96-9
11β,7α-dihydroxy-21-<(methylsulfonyl)oxy>pregn-4-ene-3,20-dione
→
128887-38-7
21-(N-tert-butyloxycarbonyl)aminoacetoxy-11β,17α-dihydroxypregn-4-ene-3,20-dione