[{"from": "human", "value": "What can you tell me about this molecule? [C][C@@H1][Branch1][N][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][NH1+1][=C][Branch1][C][N][N]"}, {"from": "gpt", "value": "The molecule is the cation obtained by protonation of the imine nitrogen of (5S)-5-methyl-L-arginine. It is a conjugate acid of a (5S)-5-methyl-L-arginine."}]