COc1cccc([C@@H]2Oc3ccc(Br)cc3C(=O)[C@H]2OC(=O)N[C@H]2CCCc3ccccc32)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?