COc1cc(O)c2c(O)c3c(c4c2c1[C@]1(C4)C(C)=CCCC1(C)C)[C@H](O)[C@@]1(O)CC(O)=C(C(N)=O)C(=O)[C@@]1(O)C3=O
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?