The compounds represented by the following structural formula (I) STR1 wherein m is 1 or 2; n is 1, 2 or 3; R' is hydrogen or methyl; R is a radical selected from the group consisting of: STR2 wherein R. sub.1 is C 8 to C 13 alkyl, C 7 to C 12 alkoxy, C 7 to C 12 thioalkyl, C 10 to C 12 1-alkynyl, 11-dodecynyl, 1-trans-dodecenyl, 5-(4-acetyl-3-hydroxy-2-propylphenoxypentoxy, 2(Z), 5(Z)-undecadienyloxy, phenyl-C 4 to C. sub.10 alkyl with the phenyl optionally mono substituted with bromo, chloro, trifluoromethyl, methoxy, methylthio or trifluoromethylthio, phenylthio-C 3 to C 9 alkyl with the phenyl optionally mono substituted with bromo, chloro, trifluoromethyl, methoxy, methylthio or trifluoromethylthio, phenyl-CH. dbd.CH--(CH 2) 2-8, phenyl-C 3 to C 9 alkoxy, trifluoromethyl-C 7 to C 12 alkyl, cyclohexyl-C 4 to C 10 alkyl or STR3 wherein each q is 0, 1, 2 or 3 but the sum of both q's does not exceed 3, and R 2 is hydrogen, bromo, chloro, methyl, trifluoromethyl, hydroxy, methoxy or nitro; or R 1 is hydrogen and R. sub.2 is C 8 to C 13 alkyl, C 7 to C 12 alkoxy, C 7 to C 12 thioalkyl, C 10 to C. sub.12 1-alkynyl, 11-dodecynyl, 1-trans-dodecenyl, 5-(4-acetyl-3-hydroxy-2-propylphenoxy(pentoxy, 2(Z), 5(Z)-undecadienyloxy, phenyl-C 4 to C. sub.10 alkyl with the phenyl optionally mono substituted with bromo, chloro, trifluoromethyl, methoxy, methylthio or trifluoromethylthio, phenylthio-C 3 to C 9 alkyl with the phenyl optionally mono substituted with bromo, chloro, trifluoromethyl, methoxy, methylthio or trifluoromethylthio, phenyl-CH. dbd.CH--(CH 2) 2-8, phenyl-C 3 to C 9 alkoxy, trifluoromethyl-C 7 to C 12 alkyl, cyclohexyl-C 4 to C 10 alkyl or STR4 wherein each q is 0, 1, 2 or 3 but the sum of both q's does not exceed 3, and p is 0 or 1, with the proviso that R is not a thiophene radical and any of R 1 and R. sub.2 above are not thioalkyl or phenylthioalkyl when p is 1; and pharmaceutically acceptable salts thereof have been found to be leukotriene antagonists and useful in the treatment of diseases in which leukotrienes are a factor, such as asthma.