COc1ccc(C2CC(=O)C(C(c3ccc(O)cc3)C3C(=O)CC(c4ccc(OC)cc4)CC3=O)C(=O)C2)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?