| abstract |
Compounds of the formula WHEREIN A is alkylene of 2 to 6 carbon atoms, R1 is hydrogen, lower alkyl, lower alkoxy, hydroxyl, or lower alkanoyloxy, R2 is hydrogen, lower alkyl or lower alkoxy, R3 is hydrogen, methyl or ethyl, R4 is hydrogen, lower alkyl or lower alkoxy, R5 is hydrogen, hydroxyl, lower alkanoyloxy or lower alkyl-sulfonamido, and R6 is hydrogen or lower alkanoyl, AND NON-TOXIC, PHARMACOLOGICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF THE COMPOUNDS AS WELL AS THEIR SALTS ARE USEFUL AS PERIPHERAL VASODILATORS, ANTIHISTAMINICS AND SPASMOLYTICS. |