Zafirlukast Impurity F

Chemical Name: N-[3-[[2-Methoxy-4-[[[3-[[2-methoxy-4-[[[(2-methylphenyl)sulfonyl]amino]carbonyl] phenyl]methyl]-1-methyl-1H-indol-5-yl]amino]carbonyl]phenyl]methyl]-1-methyl-1H-indol-5-yl]carbamic acid cyclopentyl ester