Montelukast Sodium EP Impurity A

Chemical Name: 1-[[[(1S)-1-[3-[(1E)-2-(7-Chloro-2-quinolinyl)ethenyl]phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]sulfanyl]methyl]cyclopropyl]acetic acid sodium salt (as per EP);

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