O=C1[C@H]2C3C=CC([C@@H]4C(=O)N(CO)C(=O)[C@H]34)[C@H]2C(=O)N1CO
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?