Benzothiophenes with novel basic side chains

A compound of formula I

• wherein R1 is selected from the group of H, OH, an alkoxy, OCOaryl, OCON(C1-C6 alkyl)2, OCO(C1-C6 alkyl), OCONH((C1-C6 alkyl), OSO2(C1-C6 alkyl), or halogen;
• R2 is selected from the group of H, OH, alkoxy, OCO(C1C6 alkyl), OCONH(C1-C6 alkyl), OCON(C1-C6 alkyl)2, OSO2(C4-C6 alkyl), or halogen;
• with the proviso that when one of R1 or R2 is halogen, the other is not;
• and
• wherein R4 and R5, together with the nitrogen to which they are attached, form a group selected form the group of:
• and pharmaceutically acceptable salts thereof.