5,7-dichloro-4-[(6-ethoxycarbonylmethyl-pyridin-3-ylcarbamoyl)-methoxy]-naphthalene-2-carboxylic methyl ester 、
氢氧化锂 以gives the title compound in 48% yield的产率得到4-[(6-carboxymethyl-pyridin-3-ylcarbamoyl)-methoxy]-5,7-dichloro-naphthalene-2-carboxylic acid