C[C@@H](O)C#Cc1ccc2c(c1)O[C@H](CN(C)Cc1ccc(-c3ccccc3)cc1)[C@H](C)CN([C@H](C)CO)S2(=O)=O
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?