COc1ccc(O[C@H]2C=C[C@@H](c3ccccc3)O[C@H]2CO/N=C2/c3cc(OC)ccc3O[C@@H](c3cccc(OC)c3)[C@H]2O)cc1
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?