2,4-dichloro-3,8-dimethoxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepine-7-carboxylic acid methyl ester 、 alkaline earth salt of/the/ methylsulfuric acid 生成 3,5-dichloro-4'-hydroxy-4,6'-dimethoxy-6,2'-dimethyl-2,3'-oxy-di-benzoic acid dimethyl ester