CN(C(=O)Cc1ccc(Cl)c(Cl)c1)[C@@H]1CC[C@@]2(CCCO2)C[C@H]1N1CCCC1.CS(=O)(=O)O
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?