CC(=O)c1ccc(N2CCN(C(=O)CCC(=O)Nc3ccc4nc(N5CCCCC5)cc(C)c4c3)CC2)cc1
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?