Abstract:
Compounds of the structure: ##STR1## wherein R. sub. 1, R. sub. 2, R. sub. 3, R. sub. 4, R. sub. 5, and R. sub. 6 are hydrogen, alkyl, alkenyl, alkynyl, phenyl-alkyl, or cycloalkyl, n is an integer from 0 to 4 inclusive, M is heterocyclic or heterocyclic alkyl, Y is hydroxy, alkoxy, amino, or substituted amino, amino-alkanoyl, aryloxy, aminoalkoxy, or hydroxyalkoxy, and R. sub. 7 is hydrogen, alkanoyl, carboxylalkanoyl, hydroxyalkanoyl, amino-alkanoyl, cyano, amidino, carbalkoxy, ZS, or ##STR2## wherein Z is hydrogen, alkyl, kydroxyalkyl, aminoalkyl or the radical ##STR3## wherein R. sub. 1, R. sub. 2, R. sub. 3, R. sub. 4, R. sub. 5, R. sub. 6, n, M and Y are as described above; and where Y is hydroxy their nontoxic, pharmaceutically acceptable alkali metal, alkaline earth metal, and amine salts.