6-methyl-1,3-oxazine-2,4-dione

二乙酰乙酸乙酯

2-(2-甲基-1,3-二氧杂环戊烷-2-基)乙酸乙酯

ethyl (5aR,5bS,7aR,8R,10aS,10bS)-2,5a,7a-trimethyl-8-((R)-6-methylheptan-2-yl)-3-oxo-2-((trimethylsilyl)oxy)octadecahydrocyclobuta[j]cyclopenta[a]phenanthrene-1-carboxylate

ethyl (5aR,5bS,7aR,8R,10aS,10bS)-1,5a,7a-trimethyl-8-((R)-6-methylheptan-2-yl)-3-oxo-1-((trimethylsilyl)oxy)octadecahydrocyclobuta[j]cyclopenta[a]phenanthrene-2-carboxylate