cumingianoside C 在
对甲苯磺酸 作用下,
以
二氯甲烷 为溶剂,
以2.8 mg的产率得到[(2R,3S,4S,5R,6R)-6-[[(3R,5R,7R,8R,9R,10S,13S,17S)-3-acetyloxy-17-[(2S,4R,5S)-4,5-dihydroxy-6-methoxy-6-methylheptan-2-yl]-4,4,8,10,13-pentamethyl-2,3,5,6,7,9,11,12,16,17-decahydro-1H-cyclopenta[a]phenanthren-7-yl]oxy]-3,4,5-trihydroxyoxan-2-yl]methyl acetate