C=C(C)C1Cc2c(cc(O)c3c(=O)c4c(oc23)C(O)Oc2cc(OC)c(OC)cc2-4)O1
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?