N-Heterocyclic-9-xanthenylamines

A compound of the formula:

• ##STR3## in which:
• R.sub.1 is hydrogen, halogen, hydroxy, lower alkyl or lower alkoxy;
• R.sub.2 is hydrogen, halogen, lower alkyl or lower alkoxy;
• R.sub.3 is hydrogen or lower alkyl;
• R.sub.4 is hydrogen, lower alkyl, allyl, propargyl, cycloalkyl having 3 to 6 carbon atoms, lower alkanoyl, lower alkoxycarbonyl, carbamoyl, N-lower alkylcarbamoyl, N,N-di- lower alkylcarbamoyl, phenyl or benzyl;
• m is 1 or 2 and n is 2 or 3, the sum of m and n being 3 or 4
• or a pharmaceutically acceptable acid addition salt thereof.