CC(C)(C)CC(C)(C)NC1=Nc2ccc([N+](=O)[O-])cc2N[C@@]12C[C@@H]1CCN3C(=O)CCC[C@H](C2)[C@H]13
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?