CC(C)(C)OC(=O)C(Cc1ccc(OC(C)(C)C)cc1)NC(=O)CNC(=O)CNC(=O)OCc1ccccc1
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?