Patent ID: 8846685

Claim:
A compound of the formula: wherein: R 6 is a unit chosen from: i) hydrogen; ii) substituted or unsubstituted C 1 -C 6 linear, C 3 -C 6 branched, or C 3 -C 6 cyclic alkyl; iii) substituted or unsubstituted phenyl; or iv) substituted or unsubstituted heteroaryl; said substitutions are chosen from methyl, ethyl, isopropyl, chloro and —SO 2 R 7 ; R 7 is C 1 -C 4 linear, C 3 -C 4 branched, or C 3 -C 4 cyclic alkyl, or substituted or unsubstituted phenyl; R 3 is hydrogen or methyl; R 1 is chosen from: i) hydrogen; ii) C 1 -C 6 linear or C 3 -C 6 branched alkyl; iii) benzyl; or a pharmaceutically acceptable salt thereof.