CC1=C(C(=O)Nc2ccc(Cl)c(Cl)c2)C(c2ccco2)C(C(=O)Nc2ccc(Cl)c(Cl)c2)=C(C)N1
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?