CC1=C(C(=O)Nc2ccc([N+](=O)[O-])cc2)C(c2ccccc2O)C(C(=O)Nc2ccc([N+](=O)[O-])cc2)=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?