Dihydrobenzopyran compounds and pharmaceutical composition comprising said compounds

A pharmaceutical composition comprising (1) an amount, effective for treatment of diseases of the cardiovascular system, of a compound represented by the following formula (I) or a pharmaceutically acceptable acid addition salt thereof and (2) a pharmaceutically acceptable diluent or carrier, ##STR105## wherein A represents a direct bond or the bond --CH.sub.2 --O--,

• R.sub.1 represents a member selected from the group consisting of a C.sub.3 -C.sub.5 alkyl group, a hydroxy-(C.sub.3 -C.sub.5)alkyl group, a lower alkylamino-lower alkyl group, a nitrato-(C.sub.3 -C.sub.5 alkyl) group and a phenyl-(C.sub.1 -C.sub.5 alkyl) group, provided that the phenyl may be substituted by a lower alkoxy group,
• R.sub.2 represents a member selected from the group consisting of hydrogen, halogen, OH, NO.sub.2, a carbamoyl group, a lower alkyl group, a lower alkoxy group, a lower alkyleneoxy group and acetyl group,
• R.sub.3 represents hydrogen or NO.sub.2,
• B represents a direct bond, a C.sub.1 -C.sub.7 alkylene group, a --O-- lower alkylene group or a --CONH-lower alkylene group, and
• n represents 1 or 2.