CC(=O)O/C(=C(/C#N)C(=O)O)C1C(C(=O)O)C(c2ccccc2[N+](=O)[O-])C=C(c2ccco2)N1c1ccncc1
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?