O=C(NC1CCN(Cc2ccccc2)CC1)c1ccc(N2CC3CC(C2)c2cccc(=O)n2C3)c([N+](=O)[O-])c1
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?