Montelukast

Chemical Name: [1-[[[(1R)-1-[3-[(E)-2-(7-chloroquinolin-2-yl)ethenyl]phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]sulfanyl]methyl]cyclopropyl]acetic acid (as per EP); 1-[[[(R)-m-[(E)-2-(7-chloro-2-quinolyl)vinyl]-α-[o-(1-hydroxy-1-methylethyl)phenethyl]benzyl]thio]-methyl]cyclopropane acetic acid (as per USP)

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