C[C@H]1CN([C@H](C)CO)C(=O)c2cccc(NC(=O)C3CCCCC3)c2O[C@@H]1CN(C)S(=O)(=O)c1cccs1
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?