Benzopyran derivatives

A compound selected from those of formula (I):

• ##STR17## in which Ar represents phenyl, naphthyl, substituted phenyl or substituted naphthyl,
• n represents an integer of 1 to 4 inclusive,
• RB and RC together form a --(CH.sub.2).sub.q -- bridge with q having the value 1 or 2 and, in this case, A represents a --(CH.sub.2).sub.p -- bridge with p representing 0, or 1 and such that p+q=2, and in this case RA represents hydroxyl or alkoxy situated in the 5-position of the aromatic ring which carries it or RA represents hydrogen or halogen, in any position on the aromatic ring,
• or RB and RC together form a --CH.dbd. bridge, and the bond which bonds it to the aromatic ring is single, and in this case A represents CH.sub.2 and RA represents hydrogen, hydroxyl or alkoxy situated in the 5-position of the aromatic ring which carries it,
• or RB and RC together form a single bond and then A represents a group ##STR18## the carbonyl being bonded to the oxygen and the bond connecting A to the carbon carrying the side chain is double, and in this case RA represents hydrogen, hydroxyl or alkoxy,
• X and Y each represent hydrogen and RD, which only exists when all the bonds of the carbon which carries it are single, represents hydrogen,
• it being understood that, except when otherwise mentioned,
• the terms "alkyl" and "alkoxy" denote linear or branched saturated groups having 1 to 6 carbon atoms inclusive,
• the term "substituted" concerning the phenyl and naphthyl substituents means that the latter can be substituted by one to three groups chosen from hydroxyl, alkyl, alkyl substituted by one or a number of halogens, alkoxy and halogen,
• an optical isomer thereof in the pure form or in the form of a mixture, and an addition salt thereof with a pharmaceutically-acceptable acid or base.