8-ethyl-3-hydroxy-2-(1-phenylcyclopropyl)quinoline-4-carboxylic acid 、
5-羟基靛红 、
2-(1-(4-chlorophenyl)cyclopropyl)-2-oxoethyl acetate 以to yield Compound 23 (0.09 g, 25% yield)的产率得到2-(1-(4-chlorophenyl)cyclopropyl)-3,6-dihydroxyquinoline-4-carboxylic acid