A pharmaceutical composition comprising of an active compound and a pharmaceutically-acceptable carrier or diluent, said active compound selected from a compound of the formula ##STR36## wherein R.sup.1 is selected from hydrido, alkyl, cycloalkyl, aralkyl, aryloxyalkyl, arylthioalkyl, ##STR37## with each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 being independently selected from hydrido, alkyl, cycloalkyl, aryl and aralkyl;
- wherein each of X and Y is independently selected from hydroxyl, alkoxy, alkylthio, amino and ##STR38## with each of R.sup.6 and R.sup.7 being independently selected from hydrido, alkyl, cycloalkyl, aryl and aralkyl;
- wherein any of R.sup.1 through R.sup.7 groups having a substitutable position may be substituted with one or more substituents selected from hydroxyl, halo, alkyl, haloalkyl, cyano, alkoxy, alkylthio, sulfinyl, sulfonyl, sulfinylalkyl, sulfonylalkyl, amino, acyl, acyloxy, alkoxycarbonyl and aminocarbonyl;
- or a pharmaceutically-acceptable salt thereof.