CCOC(=O)/C=C(/C(=O)OCC)n1cc(C)c(=O)n(/C(=C/C(=O)OCC)C(=O)OCC)c1=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?