Indole, indazole and benzisoxazole compounds

A compound of formula (I):

• ##STR32## in which:
• R.sub.1 represents hydrogen, halogen, linear or branched (C.sub.1 -C.sub.6)alkyl, linear or branched (C.sub.1 -C.sub.6)-alkoxy, cyano, or aminocarbonyl, or any one of the following groups:
• ##STR33## in which m is equal to 1, 2 or 3,
• n is equal to 0, 1 or 2,
• T represents CO or SO.sub.2,
• R.sub.4 or R.sub.5, which are identical or different, represent hydrogen, linear or branched (C.sub.1 -C.sub.6)alkyl, or phenyl (unsubstituted or substituted by one or a number of halogen, alkyl, alkoxy, or trihalomethyl),
• R.sub.2 represents hydrogen, linear or branched (C.sub.1 -C.sub.6)alkyl, phenyl (unsubstituted or substituted by one or a number of halogen, alkyl, alkoxy, or trihalomethyl) or acyl,
• R.sub.3 represents hydrogen, linear or branched (C.sub.1 -C.sub.6)alkyl (optionally substituted by hydroxyl or phenyl (itself unsubstituted or substituted by one or a number of halogen, alkyl, alkoxy, or trihalomethyl)), or linear or branched (C.sub.1 -C.sub.6)alkoxycarbonyl, --X--Y.dbd. represents --N--C.dbd., --N--N.dbd. or else ##STR34## represents --O--N.dbd.;
• its enantiomers, diastereoisomers and epimers, and its addition salts with a pharmaceutically-acceptable acid.