5-氯磺酰基-2-羟基苯甲酸 、 4-[(9H-Fluoren-9-ylmethoxycarbonylamino)-methyl]-thiophene-2-carboxylic acid 、 alkaline earth salt of/the/ methylsulfuric acid 以17.6 mg的产率得到5-{[5-((S)-2-Carboxy-1-formyl-ethylcarbamoyl)-thiophen-3-ylmethyl]-sulfamoyl}-2-hydroxy-benzoic acid