[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an alpha-amino acid anion having methylselanylmethyl as the side-chain. It is a conjugate base of a Se-methylselenocysteine."}, {"from": "gpt", "value": "[C][Se][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][N]"}]