| abstract |
Compounds of the formula < IMAGE > wherein A is < IMAGE > where R1 is hydrogen or alkyl of 1 to 3 carbon atoms R2 is alkoxy of 1 to 3 carbon atoms R3 is alkoxy of 1 to 3 carbon atoms or, together with R2, methylenedioxy or ethylenedioxy R4 is hydrogen, alkyl of 1 to 3 carbon atoms or benzyl R5 is hydrogen or alkyl of 1 to 3 carbon atoms R6 is hydrogen or alkoxy of 1 to 3 carbon atoms R7 is alkoxy of 1 to 3 carbon atoms or, together with R6, methylenedioxy or ethylenedioxy and N IS 2 OR 3 AND NON-TOXIC, PHARMACOLOGICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF THE COMPOUNDS AS WELL AS THEIR SALTS ARE USEFUL AS H |