SMILES: C[C@@]1([C@H]2[C@@H]([C@H]3[C@@H](C(=O)C(=C([C@]3(C(=O)C2=C(C4=C1C=CC=C4O)O)O)[O-])C(=O)N)[NH+](C)C)O)O
Description: The molecule is a zwitterion obtained by transfer of a proton from the 2-hydroxy group to the adjacent tertiary amino group of oxytetracycline; major species at pH 7.3. It is a zwitterion and an a tetracycline zwittterion. It is a tautomer of an oxytetracycline.