CCOP(=O)(OCC)OC1c2[nH]cc(C(=O)OCc3ccccc3)c2-c2cc(C(=O)OC)[nH]c2C1OC
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?