Compounds of the formula: ##STR00001## wherein: n is an integer from 1-3; X is N, CH, provided that when X is N, n is 2 or 3; R is alkyl of 1 to 3 carbon atoms; R.sup.1 is 2,4-diCl, 5-OMe; 2,4-diCl; 3,4,5-tri-OMe; 2-Cl, 5-OMe; 2-Me, 5-OMe; 2,4-di-Me; 2,4-diMe-5-OMe, 2,4-diCl, 5-OEt; R.sup.2 is alkyl of 1 to 2 carbon atoms, and pharmaceutically acceptable salts thereof.