ethyl (E) 6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-2,2,4-trimethyl-3-hydroxy-4-hexenoate                                                                                                                                                                                              以
                                                                                         
diethyl ether ethyl acetate                                                                                  为溶剂,
                                                                                                                                                                                        以are obtained (E)-6-(1,3-dihydro-4-hydroxy-6-methoxy -7-methyl-3-oxoisobenzofuran-5-yl)-2,2,4-trimethyl-3-hydroxy-4-hexenoic acid, m.p. 180°-181° C. (ether/ethyl acetate)的产率得到(E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-2,2,4-trimethyl-3-hydroxy-4-hexenoic acid