SMILES: CC1=C2C=CC=C(C2=C(C3=C1C[C@H]4[C@@H](C(=O)C(=C([C@]4(C3=O)O)[O-])C(=O)N)[NH+](C)C)O)O
Description: The molecule is zwitterionic form of anhydrotetracycline arising from transfer of a proton from the 2-hydroxy to the tertiary amino group; major species at pH 7.3. It is a zwitterion and a tertiary alpha-hydroxy ketone. It is a tautomer of an anhydrotetracycline.