O=C1O[C@H](COC(=O)c2ccccc2)[C@@H](OC(=O)c2ccccc2)C=C1OC(=O)c1ccccc1
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?