CCCC#Cc1ccc2c(c1)O[C@H](CN(C)C(=O)CC1CC1)[C@H](C)CN([C@@H](C)CO)S2(=O)=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?