Trifluoroacetic acid → 2-{[4-(2-{[3-(4-chlorophenyl)-1-methyl-1H-pyrazol-5-yl]amino}ethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid

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The compound obtained using {2-[(2-tert-butoxy-1,1-dimethyl-2-oxoethyl)thio]-1,3-thiazol-4-yl}acetic acid synthesized in Example 3 and 3-(4-chlorophenyl)-1-methyl-1H-pyrazole-5-amine as starting materials and by operations similar to those of Example 242-1 and Example 242-2 was treated with dichloromethane and trifluoroacetic acid, and the mixture was stirred at room temperature for 12 hr. The reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel chromatography (elution solvent; chloroform:methanol=20:1) to give the title compound.

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