O=C(Cc1cccc(NC(=O)C2CCN(C(=O)C3CCC3)CC2)c1)Nc1cccc(C(=O)N2CCCC2)c1
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?