Cc1ccc(N2C(=O)N3[C@H](c4cccc(C)c4)[C@@H]4C(=O)N(Cc5ccccc5)C(=O)[C@@H]4[C@]3(C)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?