C/C=C(/C)C(=O)O[C@@H]1c2cc3c(c(OC)c2-c2c(cc(OC)c(OC)c2OC)[C@@H](OC(C)=O)[C@@H](C)[C@H]1C)OCO3
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?