COC(=O)[C@H](CC(C)C)N(Cc1ccccc1)S(=O)(=O)N(Cc1ccc(OC)cc1)[C@@H](CC(C)C)C(=O)OC
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?