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)[NH2+]C)O)O
Description: The molecule is a zwtterion obtained by transfer of a proton from the 2-hydroxy to the secondary amino group of desmethylanhydrotetracycline. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a tautomer of a desmethylanhydrotetracycline.