O=C(O)C(=O)O.O=[N+]([O-])c1cc2c(cc1CN1CCN(C/C=C/c3ccccc3)CC1)OCO2
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?