O=C(c1ccc(-c2nnc(Nc3cccc(Cl)c3)c3ccccc23)cc1)N1C[C@H]2C[C@H](C1)c1cccc(=O)n1C2
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?