[{"from": "human", "value": "Provide a description of this molecule. [C][Se][C][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1]"}, {"from": "gpt", "value": "The molecule is a D-alpha-amino acid cation having methylselanylmethyl as the side-chain. It is a conjugate acid of a Se-methyl-D-selenocysteine. It is an enantiomer of a Se-methyl-L-selenocysteinium."}]