[Methyl-((R)-1-methyl-piperidin-3-yl)-amino]-acetic acid

[Methyl-((S)-1-methyl-pyrrolidin-2-ylmethyl)-amino]-acetic acid

[Ethyl-((S)-1-methyl-pyrrolidin-3-yl)-amino]-acetic acid

[Ethyl-(1-methyl-pyrrolidin-2-ylmethyl)-amino]-acetic acid

(1R,4R)-[(4-Dimethylamino-cyclohexyl)-ethyl-amino]-acetic acid

[Isopropyl-(1-methyl-pyrrolidin-3-ylmethyl)-amino]-acetic acid

[Isopropyl-(1-methyl-piperidin-4-yl)-amino]-acetic acid

[Cyclopropyl-(1-methyl-piperidin-2-ylmethyl)-amino]-acetic acid

(1R,4R)-[Cyclopropyl-(4-dimethylamino-cyclohexyl)-amino]-acetic acid

(2-Hydroxymethyl-pyrrolidin-1-yl)-acetic acid

((S)-3-Hydroxy-piperidin-1-yl)-acetic acid