CC1OCC2OC(C)OC(C3C4=C(CC(C)(C)CC4=O)OC4=C3C(=O)CC(C)(C)C4)C2O1
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?