CC1OC(OC2C(Oc3cc(O)c4c(c3)O[C@H](c3ccc(O)cc3)CC4=O)OC(CO)C(O)C2O)C(O)C(O)C1O
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?