COC1=CC(=O)c2c(O)c3c(c(O)c2C1=O)OC1(Oc2c(cc4cc(C)oc(=O)c4c2O)CC1O)C3O
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?