[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][Ring1][C][O][N][Branch1][Ring2][C][C][O][C][C][S][=Branch1][C][=O][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a Good's buffer substance, pKa = 7.15 at 20 \u2103. It is a BES and an amino sulfonic acid. It is a conjugate acid of a 2-[bis(2-hydroxyethyl)amino]ethanesulfonate. It is a tautomer of a 2-[bis(2-hydroxyethyl)ammonio]ethanesulfonate."}]