8-(3-Amino-benzenesulfonylamino)-6-tert-butyl-chroman-2,2-dicarboxylic acid diethyl ester 、 3-[(6-tert-Butyl-8-isocyanato-4-oxo-4H-chromene-2-carbonyl)-amino]-5-diethylsulfamoyl-benzoic acid ethyl ester 生成 6-tert-Butyl-8-(3-{3-[6-tert-butyl-2-(3-diethylsulfamoyl-5-ethoxycarbonyl-phenylcarbamoyl)-4-oxo-4H-chromen-8-yl]-ureido}-benzenesulfonylamino)-chroman-2,2-dicarboxylic acid diethyl ester