COc1ccc(C(=O)/C=C/c2ccc(OCCCOc3ccc(/C=C/C(=O)c4ccc(OC)c(OC)c4)cc3)cc2)cc1OC
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?