O=C1CC2(CCC(O)(c3cccc4ccccc34)C(C(=O)c3cccc4ccccc34)C2)C(=O)c2ccccc2N1
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?