1-(acetyloxy)-3-methyl-2-butanone

1-溴-3-甲基-2-丁酮

(2R,3S,5S,8S,9S,10R,13S,14S,17R)-17-((S)-1-((4R,5R)-2,2-dimethyl-5-((S)-3-methylbutan-2-yl)-1,3-dioxolan-4-yl)ethyl)-2,3-dihydroxy-10,13-dimethylhexadecahydro-6H-cyclopenta[a]phenanthren-6-one

4-(1-methylethyl)furan-2(5H)-one

(22E,24S)-5α-stigmasta-2,22-dien-6-one