COC(=O)[C@@H]1C[C@H]2OC(=O)CC[C@]2(C)O[C@H]1[C@H]1O[C@@](C)(O)CCC[C@H]1C
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?