CCOC(=O)CCC(C(=O)OCC)n1nnc2ccc(Nc3c(C)[n+]([O-])c4cc(Cl)ccc4[n+]3[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?