| 摘要 |
<p>Cpds. of formula (I) (not given) in which R2 is H or OH, and C9-C11, -C1-C2- and Y are various gps., are made by hydrolysis of 16,17-substd. methylene-dioxy steroids of formula (II) (not given), in which R is H, OH or lower alkanoyloxy, R1 and R2 are H or lower alkyl, by heating to 50-110 deg.C with a 20-60% aq. formic acid soln.</p> |
