Montelukast EP Impurity B

Chemical Name: [1-[[[(1R)-1-[3-[(E)-2-(7-chloroquinolin-2-yl)ethenyl]phenyl]-3-[2-(1-methylethenyl)phenyl]propyl]sulfanyl]methyl]cyclopropyl]acetic acid (as per EP); [1-[[[(1R)-1-[3-[(E)-2-(7-Chloroquinolin-2-yl)ethenyl]phenyl]-3-[2-(1-methylethenyl)phenyl]propyl]sulfanyl]methyl]cyclopropyl]acetic acid (as per USP)

Synonym:  Montelukast Methylstyrene (USP)

Smile: C=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)C