has role has role quaternary ammonium salt 1,1-dimethyl-4-phenylpiperazinium iodide DMPP CHEBI:4290 DMPP iodide 1,1-Dimethyl-4-phenylpiperazinium Iodide 1,1-Dimethyl-4-phenylpiperazine iodide Dimethylphenylpiperazinium iodide N,N-Dimethyl-N'-phenylpiperazinium iodide chebi_ontology N-arylpiperazine piperazinium salt nicotinic acetylcholine receptor agonist organic iodide salt