O=C(CCCC(=O)N1CC(CCl)c2ccc([N+](=O)[O-])cc21)N1CC(CCl)c2ccc([N+](=O)[O-])cc21
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?