O=C(O)C(=O)O.O=[N+]([O-])c1ccc(N2CCN(Cc3ccc([N+](=O)[O-])o3)CC2)cc1
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?