O=C1/C(=C/c2ccc(OC(=O)c3ccccc3)cc2)CCC/C1=C\c1ccc(OC(=O)c2ccccc2)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?