[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a Good's buffer substance, pKa = 6.9 at 20 \u2103. It is an ACES and an amino sulfonic acid. It is a tautomer of a 2-[(2-amino-2-oxoethyl)ammonio]ethanesulfonate."}, {"from": "gpt", "value": "[C][Branch1][#Branch2][C][S][=Branch1][C][=O][=Branch1][C][=O][O][N][C][C][=Branch1][C][=O][N]"}]