Boehringer Ingelheim Gmbh

Edward A Barsumian

Karl D Hargrave

John P Devlin

Compounds of the formula ##STR1## wherein R is hydrogen or ##STR2## A is alkyl of 1 to 8 carbon atoms; cycloalkyl of 3 to 7 carbon atoms; phenyl; or phenyl mono-, di- or tri-substituted independently with alkyl of 1 to 4 carbon atoms, halogen, trihalomethyl, alkoxy of 1 to 3 carbon atoms, carboxylic acyl of 1 to 3 carbon atoms, carboxyl, (alkoxy of 1 to 3 carbon atoms)carbonyl, nitro, cyano or di(alkyl of 1 to 3 carbon atoms)amino;

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Danbury, CT, United States of America

Edward A Barsumian