5,7-dichloro-4-hydroxy-2-naphthoate 、
[4-(2-chloroacetylamino)-phenoxy]-acetic acid tert-butyl ester 以gives 4-[(4-tert-butoxycarbonylmethoxyphenylcarbamoyl)-methoxy]-5,7-dichloronaphthalene-2-carboxylic acid methyl ester (13bo) in 66% yield, e) in analogy的产率得到4-[(4-tert-butoxycarbonylmethoxyphenylcarbamoyl)-methoxy]-5,7-dichloronaphthalene-2-carboxylic acid methyl ester