A compound selected from 6-[5-(1-aminoethyl)-1H-1,2,4-triazol˜]-yl] pyrimidine-4-carbonitrile hydrochloride, 6-[5-[(1S)-1-aminoethyl]-1,2,4-triazol-1-yl] pyrimidine-4-carbonitrile, 6-[5-[(IS)-1-aminoethyl]-3-methyl-1,2,4-triazol-1-yl] pyrimidine-4-carbonitrile hydrochloride, 6-[5-[(IS)-1-aminoethyl]-3-cyclopropyl-1,2,4-triazol-1-yl] pyrimidine-4-carbonitrile hydro-chloride, 6-[5-[(IS)-1-aminoethyl]-3-methyl-1,2,4-triazol-1-yl] pyrimidine-4-carboxamide hydrochloride, 6-[5-[(1S)-1-aminoethyl]-3-cyclopropyl-1,2,4-triazol-1-yl] pyrimidine-4-carboxamide hydro-chloride, 6-[5-[(IS)-1-aminoethyl]-1,2,4-triazol-1-yl] pyrimidine-4-carboxamide hydrochloride, methyl 6-[5-[(IS)-1-(tert-butoxycarbonylamino) ethyl]-3-cyclopropyl-1,2,4-triazol-1-yl] pyrimidine-4-carboxylate, 6-[5-[(IS)-1-aminoethyl]-3-cyclopropyl-1,2,4-triazol-1-yl]-N-methyl-pyrimidine-4-carboxamide hydrochloride, 6-[5-[(1S)-1-aminoethyl]-3-cyclopropyl-1,2,4-triazol-1-yl]-N,N-dimethyl-pyrimidine-4-carboxamide hydrochloride, or salts thereof, or free amines thereof.