Derivatives of 3-imino-1,2-dithioles, method for producing them and pharmaceutical compositions containing the same

A compound selected from those of formula (I):

• wherein:
• Het1 and Het2, which may be identical or different, each represents an optionally substituted pyridyl,
• A represents a bond or linear or branched (C1-C6)alkylene,
• its optical isomers, where they exist, or addition salts thereof with a pharmaceutically acceptable acid,
• wherein optionally substituted is to be understood as meaning optionally substituted by one or more identical or different atoms or groups selected from halogen, linear or branched (C1-C6)alkyl, hydroxy, linear or branched (C1-C6)alkoxy, linear or branched (C1-C6)polyhaloalkyl, nitro and amino (optionally substituted by one or more linear or branched (C1-C6)alkyl).