2-tert-Butoxycarbonylamino-6-((8R,9S,13S,14S,17R)-3-hydroxy-13-methyl-16-oxo-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-ylamino)-hexanoic acid methyl ester 在
sodium hydroxide 作用下,
以79%的产率得到2-tert-Butoxycarbonylamino-6-((8R,9S,13S,14S,17R)-3-hydroxy-13-methyl-16-oxo-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-ylamino)-hexanoic acid