SMILES: C[C@@]1([C@H]2C[C@H]3[C@@H](C(=O)C(=C([C@]3(C(=O)[C@]2(C(=O)C4=C1C=CC=C4O)O)O)[O-])C(=O)N)[NH+](C)C)O
Description: The molecule is a zwitterion obtained by transfer of a proton from the 2-hydroxy group to the 1-amino group of 11a-hydroxytetracycline. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a zwitterion and an an 11a-hydroxytetracyline zwitterion. It is a tautomer of an 11a-hydroxytetracycline.