O=[N+]([O-])c1cccc(C(O)/C(=N/Nc2ccccc2)C2Nc3ccc([N+](=O)[O-])cc3N=C2O)c1
The donor in a hydrogen bond is usually a strongly electronegative atom such as N, O, or F that is covalently bonded to a hydrogen bond. How many hydrogen bond donors does the molecule have?