CCOP(=O)(OCC)C(Nc1ccc(C(=O)O)cc1)c1ccc(C(Nc2ccc(C(=O)O)cc2)P(=O)(OCC)OCC)cc1
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?