NC(=O)CNC(=O)[C@@H]1CC2(CC(c3cccc([N+](=O)[O-])c3)=NO2)CN1C(=O)c1ccccc1
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?