COC(=O)C(=O)C(C(=O)C(=O)Nc1ccccc1[N+](=O)[O-])c1nc2ccc([N+](=O)[O-])cc2nc1O
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?