Cc1ccc(S(=O)(=O)N[C@H](C(=O)OCC(=O)N2N=C(c3ccc(Cl)cc3)CC2c2ccco2)C(C)C)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?