CC(=O)O[C@@]1(C(C)=O)CCC2C3C=C(Cl)C4=CC(=O)C5CC5[C@@]4(C)C3CC[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?