CC(C)CN1CCN(C(=O)COC(=O)c2ccc(S(C)(=O)=O)c([N+](=O)[O-])c2)CC1.O=C(O)C(F)(F)F
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?