ba2+ ( approximately 5 x 10 ( -3 ) mol/l ) , quinine ( approximately 10 ( -3 ) mol/l ) , quinidine ( approximately 10 ( -4 ) mol/l ) , lidocaine ( approximately equal to 1 mmol/l ) , tetraethylammonium ( approximately 10 mmol/l ) , cs+ ( approximately 10 mmol/l ) , and rb+ ( approximately 20 mmol/l ) all blocked this k+ channel reversibly .
C0034417
quinine
C0034414
quinidine