(2R,5S,7R,11R)-14,21-dimethoxy-5,9,9-trimethyl-17-[(2R,4R,5R,6R)-6-methyl-4,5-bis(phenylmethoxy)oxan-2-yl]-5,16-bis(phenylmethoxy)-8,10-dioxapentacyclo[11.8.0.02,7.07,11.015,20]henicosa-1(21),13,15(20),16,18-pentaene-2,3-diol                                                                                                                                                              在
                                                                                                                                                                                 
草酰氯   、                                                                                                  
二甲基亚砜   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以90%的产率得到(2S,5R,7R,11R)-2-hydroxy-14,21-dimethoxy-5,9,9-trimethyl-17-[(2R,4R,5R,6R)-6-methyl-4,5-bis(phenylmethoxy)oxan-2-yl]-5,16-bis(phenylmethoxy)-8,10-dioxapentacyclo[11.8.0.02,7.07,11.015,20]henicosa-1(21),13,15(20),16,18-pentaen-3-one