CC1OC(Oc2ccc3ccc(=O)oc3c2-c2c(O)ccc3cc(Oc4ccc5ccc(=O)oc5c4)c(=O)oc23)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?