CCCC(=O)OC[n+]1cccc(-c2c(COC(=O)NC(C)C)c(COC(=O)NC(C)C)c3n2CCC3)c1.[I-]
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?