New benzopyran compounds

A compound selected from those of formula (I):

• ##STR17## in which:
• n is 0 or 1, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.6 and R.sub.7, which are identical or different, each represents independently of one another hydrogen or lower alkyl R.sub.a --, where R.sub.a represents a linear or branched alkyl group having 1 to 8 carbon atoms, inclusive,
• R.sub.5 represents:
• hydrogen,
• lower alkyl R.sub.a --,
• lower acyl R.sub.a --CO--,
• alkoxyalkyl of formula R.sub.a --O--R.sub.b --,
• alkoxycarbonyl of formula R.sub.a --O--CO--,
• alkoxycarbonylalkyl of formuls R.sub.a --O--CO--R.sub.b --,
• carboxyalkyl of formula HOOC--R.sub.a --, where R.sub.a and R.sub.b, which are identical or different, each represent, independently of one another, a linear or branched alkyl radical having 1 to 8 carbon atoms, inclusive,
• R.sub.8 and R.sub.9
• form, together with the nitrogen atom which carries them, a group chosen from:
• piperazine and
• substituted piperazine,
• it being understood that the term "substituted" as applied to the above piperazine, and groups, means that it can be substituted by one or a number of halogen, hydroxyl, carboxyl, or R.sub.10 radicals, with R.sub.10 being chosen from:
• alkyl,
• alkoxy,
• alkenyl,
• --(CH.sub.2).sub.n --R.sub.11, where n represents 0 or an integer from 1 to 5 inclusive and where R.sub.11 represents a radical chosen from phenyl, benzhydryl, 1,1-diphenylmethylidenyl, pyrimidinyl, and pyridyl, it being possible for these radicals R.sub.10 themselves to be substituted by halogen, trifluoromethyl, oxo, carboxyl, hydroxyl, atkyl, alkoxy, haioalkoxy, acetyl, or pyrrolidinyl, its optical isomers, in the pure form or in the form of mixtures, and addition salts thereof with a pharmaceutically-acceptable acid or base.