(5Z)-2-[[(1R,2S)-2-phenylcyclopropyl]amino]-5-(quinolin-6-ylmethylidene)-1,3-thiazol-4-one (5Z)-2-[[(1R,2S)-2-phenylcyclopropyl]amino]-5-(6-quinolylmethylene)thiazol-4-one (5Z)-2-[[(1R,2S)-2-phenylcyclopropyl]amino]-5-(6-quinolylmethylene)-4-thiazolone