O=C(Nc1ccc(Br)cc1)C1C2C=CC3(O2)C1C(=O)N(CCN1CCCCC1)C3C(=O)NC1CCCCC1
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?