Patent ID: 8063212

Claim:
A compound of the formula: wherein: R 1 is aminomethyl, (C 1 -C 3 alkyl)aminomethyl, di(C 1 -C 2 alkyl)aminomethyl, N-ethyl-N-methyl-aminomethyl, 1-aminoethyl, 1-((C 1 -C 2 alkyl)amino)-ethyl, 3,3,3-trifluoropropylaminomethyl, ethynyl, 2-hydroxy-ethoxy, 2-hydroxyethylaminomethyl, 2-cyanoethylaminomethyl, morpholin-4-ylmethyl, methoxymethoxymethyl, cyclopropyl, 1-azetidinylmethyl, 1-pyrrolidinylmethyl, or 1,3-dioxolan-2-yl; R 2 is hydrogen or halo; R 3 is hydrogen or halo; provided that at least one of R 2 and R 3 is hydrogen; R 4 is hydrogen, methyl, or halo; and — is a single bond that is either present or absent; or a pharmaceutically acceptable salt thereof.