COc1cc(-c2coc3c(OC)c(OC4OC(CO)C(O)C(O)C4O)c(OC)cc3c2=O)cc(OC)c1C
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?