CC(=O)O[C@H]1[C@H](C)O[C@@H](Oc2c(-c3ccc(O)cc3)oc3c(CC=C(C)C)c(O)cc(O)c3c2=O)[C@H](O)[C@@H]1O
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?