The crystal structures of three solvates of zafirlukast [systematic name: cyclopentyl N-{1-methyl-3-[2-methyl-4-(o-tolylsulfonylaminocarbonyl)benzyl]-1H-indol-5-yl}carbamate], viz. the monohydrate, C(31)H(33)N(3)O(6)S.H(2)O, (I), the methanol solvate, C(31)H(33)N(3)O(6)S.
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