COc1cc([C@H]2c3cc4c(cc3[C@@H](O)[C@@H]3COC(=O)[C@H]23)OCO4)cc(OC)c1OC
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?