COc1cc([C@H]2Oc3cc(O)c4c(=O)cc(-c5ccc(O)cc5)oc4c3O[C@@H]2CO)ccc1O
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?