4-diphenylacetoxy-1,1-dimethylpiperidinium [ 1-dimethyl-4-diphenylacetoxypiperidinium,4-DAMP,4-DAMP methiodide,4-DAMP methobromide,4-diphenylacetoxy-1,1-dimethylpiperidinium iodide,4-diphenylacetoxy-N-methylpiperidine methiodide ] muscarinic receptor antagonist; RN given refers to parent cpd; do not confuse abbreviation 4-DAMP with a similar cpd which does not contain dimethyl groups