Tricyclic amide compounds

A compound selected from those of formula (I):

• ##STR39## in which:
• R.sup.1 represents a (C.sub.1 -C.sub.4)alkylene chain which is unsubstituted or substituted by a radical chosen from alkyl, hydroxyl, alkoxycarbonyl, and carboxyl;
• R.sup.2 represents hydrogen or alkyl;
• R.sup.3 represents:
• either a group of formula R.sup.31 ##STR40## in which n represents zero or 1 to 3, inclusive, and R.sup.5 represents hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted alkenyl, unsubstituted or substituted alkynyl, unsubstituted or substituted cycloalkyl, or unsubstituted or substituted dicycloalkylalkyl;
• and X' represents oxygen or sulfur;
• A represents a chain of formula --O--A.sup.1 -- in which A.sup.1 is a chain chosen from (C.sub.2 -C.sub.5)alkylene, (C.sub.2 -C.sub.5)alkenylene, and (C.sub.2 -C.sub.5)alkynylene;
• A.sup.1 being substituted by one or a number of groups chosen from alkoxy, hydroxyl, and oxo,
• Y forming, with the benzene ring to which it is bonded, a Y.sup.1 group chosen from naphthalene, and partially hydrogenated naphthalene;
• it being understood that:
• the expression "substituted" relating to the terms "alkyl", "alkenyl", and "alkynyl" means that these groups are substituted by one or a number of radicals chosen from halogen, alkyl, and alkoxy,
• the expression "substituted" relating to the term "cycloalkyl" or "dicycloalkylalkyl" means that these groups are substituted by one or a number of radicals chosen from:
• alkyl, alkoxy, hydroxyl, and the oxo group,
• the terms "alkyl" and "alkoxy" denote radicals containing 1 to 6 carbon atoms, inclusive,
• the terms "alkenyl" and "alkynyl" denote unsaturated radicals containing 2 to 6 carbon atoms, inclusive,
• the term "cycloalkyl" denotes a saturated cycloalkyl or unsaturated group containing 3 to 8 carbon atoms, inclusive,
• its enantiomers and diastereoisomers, and an addition salt thereof with a pharmaceutically-acceptable base.