COc1cc(C2C3=C(O)CC(C)(C)CC3=Nc3c2c(=O)[nH]c(=O)n3Cc2ccccc2)ccc1O
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?