(S)-2-{[(1R,3aS,5aR,5bR,7aR,8S,9R,11aR,11bR,13aR,13bS)-9-Acetoxy-1-acetyl-8-((S)-1-methoxycarbonyl-ethylcarbamoyl)-5a,5b,8,11a-tetramethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl]-amino}-propionic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
氢氧化钾                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以94%的产率得到(S)-2-{[(1R,3aS,5aR,5bR,7aR,8S,9R,11aR,11bR,13aR,13bS)-1-Acetyl-8-((S)-1-carboxy-ethylcarbamoyl)-9-hydroxy-5a,5b,8,11a-tetramethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl]-amino}-propionic acid