CC(C)[C@H](Nc1ccc(S(=O)(=O)N2CCOCC2)cc1[N+](=O)[O-])C(=O)OCC(=O)N(C(C)C)C(C)C
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?