18α-H methyl 11-keto-hederagenate diacetate                                                                                                                                                              在
                                                                                                                                                                                 sodium amalgam   、                                                                                                  
乙醇                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (4aS,6aS,6bR,8aR,9R,10S,12aS)-10-Acetoxy-9-acetoxymethyl-2,2,6a,6b,9,12a-hexamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b-hexadecahydro-2H-picene-4a-carboxylic acid methyl ester