a tetracycline zwitterion 409.10358 CHEBI:144644 C12=C(C=C(C(=C1C(C=3[C@]([C@@H]([C@]4([C@@H](C([O-])=C(C([C@@]4(O)C3O)=O)C(N)=O)[NH+](C)C)[H])*)(C2(*)*)[H])=O)O)*)* chebi_ontology a tetracycline 409.370 0 C21H17N2O7R5 tetracyclines