Montelukast Ketocarbinol Impurity

Chemical Name: 1-[[[(1R)-1-[3-[(1E)-2-(7-Chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(1-oxo-2-hydroxyethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid

Synonym: (4S,6S)-4-(ethylamino)-N-(((4S,6S)-4-(ethylamino)-6-methyl-7,7-dioxido-5,6-dihydro-4H-thieno[2,3-b]thiopyran-2-yl)sulfonyl)-6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-2-sulfonamide 7,7-dioxide

Smile: O=C(C1=CC=CC=C1CC[C@@H](SCC2(CC2)CC(O)=O)C3=CC=CC(/C=C/C4=NC5=CC(Cl)=CC=C5C=C4)=C3)CO