COc1cc2c(cc1OC)[C@]13CCN4CC5=CCO[C@H](CC(=O)O)[C@H]([C@H]5C[C@H]41)[C@H]3N2
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?