CC(=O)O[C@]1(C(C)=O)CC[C@@H]2[C@@H]3C=C(C)C4=CC(=O)CC[C@@]4(C)[C@H]3CC[C@]21C
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?