4-iodo-6,7-dimethoxy-phthalide   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                              在
                                                                                                                                                                                 
甲醇                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (
RS)-4-iodo-6,7-dimethoxy-3-((
SR)-6-methyl-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-
g]isoquinolin-5-yl)-phthalide   、                                                                                             (
RS)-4-iodo-6,7-dimethoxy-3-((
RS)-6-methyl-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-
g]isoquinolin-5-yl)-phthalide