O=C(CC1=Nc2nnc(-c3nnc4n3C(=O)C(CC(=O)C3CC3)=N4)n2C1=O)C1CC1
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?