Condensed thiophene compound and pharmaceutical use thereof

A condensed thiophene compound represented by the following formula (I) or a pharmaceutically acceptable salt thereof:

• ##STR44## wherein the ring S is selected from the group consisting of the following fused thiophenes:
• ##STR45## wherein R.sup.1 represents a hydrogen atom, a halogen atom, an alkyl group, an acyl group or a hydroxyalkyl group;
• R.sup.2 represents a hydrogen atom, an alkyl group, an acyl group, a carbamoyl group, a substituted carbamoyl group, an aryl group or an arylalkyl group;
• G represents a --CH.sub.2 -- group, a --CH(OR.sup.3)-- group, a --CO-- group or a --S(O).sub.t -- group;
• wherein R.sup.3 represents a hydrogen atom, an alkyl group or an acyl group and t is 0, 1, or 2;
• Q represents a straight alkylene group or a branched chain alkylene group;
• T represents a tertiary amino group;
• D represents a --CH.sub.2 group or a --S(O).sub.u -- group;
• wherein u is 0, 1 or 2;
• either (i) A is absent and B represents a carbonyl group or a thiocarbonyl group, or (ii) both A and B are absent;
• when A is absent and B is a carbonyl group or a thiocarbonyl group, m is 0 and n is 0, 1 or 2;
• when both A and B are absent, m is 0 and n is 0 or an integer of 1 to 4.