甲醛

(8R,9S,10R,13S,14S,17R)-17-acetyl-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl acetate

17-(乙酰氧基)-3-甲氧基-20-氧代-孕甾-3,5-二烯-6-甲醛

甲缩醛

二乙氧基甲烷