COc1ccc2oc(C(=O)OCC(=O)Nc3ccc(C)c(S(=O)(=O)N4CCOCC4)c3)c(C)c2c1
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?