CC(=O)OCC1OC(Oc2cc(OC(C)=O)c3c(=O)cc(-c4ccc(OC(C)=O)c(OC(C)=O)c4)oc3c2)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O
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?