[{"from": "human", "value": "Provide a description of this molecule. [C][C@@][Branch2][Branch1][O][C][=C][Branch1][S][C][=Branch1][C][=O][C][=C][Ring1][#Branch1][C][=C][C][=C][Ring1][=Branch1][O][C][=Branch1][C][=O][C@][Branch2][Ring1][#C][C@@H1][Branch1][Ring2][C][Ring1][S][C@@H1][Branch1][P][C][=Branch1][C][=O][C][=Branch1][Branch1][=C][Ring1][Branch2][O-1][C][=Branch1][C][=O][N][NH1+1][Branch1][C][C][C][O][O]"}, {"from": "gpt", "value": "The molecule is zwitterionic form of 12-dehydrotetracycline arising from transfer of a proton from the 2-hydroxy group to the adjacent tertiary amino group. It is a tautomer of a 12-dehydrotetracycline."}]