8-ethyl-3-hydroxy-2-(1-phenylcyclopropyl)quinoline-4-carboxylic acid 、
5-甲基靛红 、
2-(1-(4-chlorophenyl)cyclopropyl)-2-oxoethyl acetate 以to yield Compound 19 (0.10 g, 28% yield)的产率得到2-(1-(4-chlorophenyl)cyclopropyl)-3-hydroxy-6-methylquinoline-4-carboxylic acid