[{"from": "human", "value": "Please give me some details about this molecule. [C][Se][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1]"}, {"from": "gpt", "value": "The molecule is an alpha-amino acid cation having methylselanylmethyl as the side-chain. It is a conjugate acid of a Se-methylselenocysteine."}]