COc1cc([C@H]2CC(=O)C[C@H](c3cc(OC)c(OC)c(OC)c3)C23C(=O)c2ccccc2C3=O)cc(OC)c1OC
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?