O=C(Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4ccc([N+](=O)[O-])cc43)cc2c1)c1cc2ccccc2o1
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?