COc1ccc(N2C(=O)N3[C@H](c4ccc(Cl)cc4)[C@@H]4C(=O)N(C5CCCCC5)C(=O)[C@@H]4[C@]3(Cc3ccc(Cl)cc3)C2=O)cc1
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?