[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an organophosphonate oxoanion that is the conjugate base of (S)-(1-aminoethyl)phosphonic acid, obtained by deprotonation of the phosphonate OH groups and protonation of the amino group. Major microspecies at pH 7.3. It is a conjugate base of a (S)-(1-aminoethyl)phosphonic acid."}, {"from": "gpt", "value": "[C][C@@H1][Branch1][C][NH3+1][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}]