[{"from": "human", "value": "Provide a description of this molecule. [C][C][O][C][=Branch1][C][=O][C][Branch1][O][C][C][NH1+1][Branch1][Branch1][C][C][Ring1][=Branch1][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is an ammonium ion derivative that is the conjugate acid of pethidine, obtained from the protonation of the piperidine moiety. It is the major microspecies at pH 7.3. It is a conjugate acid of a pethidine."}]