COc1ccc(N(CC(=O)N/N=C/c2ccc(-c3ccc([N+](=O)[O-])cc3)o2)S(=O)(=O)c2ccc(C)cc2)cc1Cl
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?