C[C@]12CCC3C(C1CC[C@@]2(O)C#Cc1ccc(CN)cc1)[C@@H](O)C=C1C[C@@H](O)CC[C@@]13C
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?