1-((1R,2S,4aS,4bR,6aR,10aR,10bS,12aS)-2-Ethyl-2,4b,6a,9,9,10b,12a-heptamethyl-octadecahydro-chrysen-1-yl)-4-hydroxy-4-methyl-pentan-3-one                                                                                                                                                                                                                                                                                                          生成                                                 
3-((1R,2S,4aS,4bR,6aR,10aR,10bS,12aS)-2-Ethyl-2,4b,6a,9,9,10b,12a-heptamethyl-octadecahydro-chrysen-1-yl)-propionaldehyde