3β,7,11α-triacetoxy-cucurbita-5(10),6-diene 在
air 作用下,
以24 mg的产率得到Acetic acid (3S,8S,9S,11R,13R,14S,17R)-3-acetoxy-17-((R)-1,5-dimethyl-hexyl)-4,4,9,13,14-pentamethyl-7-oxo-1,2,3,4,7,8,9,11,12,13,14,15,16,17-tetradecahydro-19-oxa-cyclopropa[1,10]cyclopenta[a]phenanthren-11-yl ester