contains 1 or 2 nitrogen atoms ina another particular embodiment the cyclic formed by r 2 and r 3 attached to the benzene ring is substituted with at least one substituent independently selected from the group consisting of hydrogen u2550 o oh u2014 c o r 10 u2014 n r 11 r 12 c 1 5 alkyl oh and c 1 5 alkyl n r 11 r 12 wherein r 10 is a linear or branched c 1 5 alkyl radical r 11 and r 12 are independently selected from hydrogen and linear or branched c 1 5 alkyl radical in a particular embodiment r 6 is a halogen preferably chloro or bromo even in another particular embodiment r 1 and r 5 are hydrogen particular individual compounds of the invention include the compounds 1 60 in the examples either as salts or as free bases unless otherwise stated the compounds of the invention are also meant to include compounds which differ only in the presence of one or more isotopically enriched atoms for example compounds having the present structures except for the replacement of a hydrogen by a deuterium or tritium or the replacement of a carbon by a 13 c or 14 c enriched carbon or 15 n enriched nitrogen are within the scope of this invention the term u201c pharmaceutically acceptable salts and solvates u201d refers to any pharmaceutically acceptable salt ester solvate or any.