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.6 and R.sub.7, which are identical or different, each represents independently of one another hydrogen or methyl,
• R.sub.5 represents:
• hydrogen,
• lower alkyl R.sub.a -,
• lower acyl R.sub.a -CO-,
• where R.sub.a is a linear or branched alkyl radical having 1 to 8 carbon atoms, inclusive,
• R.sub.8 and R.sub.9, which are identical or different, each represent, independently of one another:
• hydrogen,
• lower alkyl R.sub.a -,
• lower alkenyl, where alkenyl represents a linear or branched unsaturated hydrocarbon having 2 to 8 carbon atoms, inclusive,
• where R.sub.a represents linear or branched lower alkyl having 1 to 8 carbon atoms, inclusive,
• alkoxycarbonylalkyl of formula R.sub.a -O-CO-R.sub.b - with R.sub.a and R.sub.b, which are identical or different, as defined above for R.sub.a,
• phenyl-(CH.sub.2)q- or substituted phenyl-(CH.sub.2)q-, with q equal to 0, 1, 2, or 3,
• it being understood that during this description of the general formula (I), the term "substituted" as applied to phenyl-(CH.sub.2)q- means that this group can be substituted by one or a number of identical or different radicals, each of which radicals represents, independently of one another:
• lower alkyl R.sub.c -,
• lower alkoxy R.sub.c -)-,
• lower acyl R.sub.c -CO-,
• trifluoromethyl,
• carboxyl,
• hydroxyl,
• oxo,
• guanidino,
• amidino,
• or a halogen atom,
• where R.sub.c represents linear or branched alkyl having 1 to 6 carbon atoms, inclusive,
• its optical isomers, in the pure form or in the form of mixtures, and addition salts thereof with a pharmaceutically-acceptable acid or base.