p. 144 - 147
(1983)acetic anhydride
16α,17α-Isopropylidenedioxypregn-4-en-11β,21-diol-3,20-dione
16α,17α-Isopropylidenedioxypregn-4-en-21-ol-3,20-dione 21-acetate
16α,17α-Isopropylidenedioxypregn-5-en-3β,21-diol-20-one 21-acetate
3β,16α,21-triacetoxy-17-hydroxy-pregn-5-en-20-one