methantheline methantheline methantheline is an antimuscarinic. methanthelineclinical dataatc codea03ab07 (who) identifiers iupac name n,n-diethyl-n-methyl-2--ethanaminium cas number5818-17-7 ypubchem cid4097chemspider3955 nunii36ei79tx7ichemblchembl1201264 ncomptox dashboard (epa)dtxsid7046964 chemical and physical dataformulac21h26no3molar mass340.443 g·mol−13d model (jsmol)interactive image smiles cc(c)(cc)ccoc(=o)c1c2=cc=cc=c2oc3=cc=cc=c13 inchi inchi=1s/c21h26no3/c1-4-22(3,5-2)14-15-24-21(23)20-16-10-6-8-12-18(16)25-19-13-9-7-11-17(19)20/h6-13,20h,4-5,14-15h2,1-3h3/q+1 nkey:gzhfodjqisukay-uhfffaoysa-n n ny (what is this?) (verify)