Here is a possible match - if your pill is white and round.
CO Atenolol (atenolol) 50 mg manufactured by Cobalt Pharmaceuticals in Canada.
Description: Each white to off-white, round, flat-faced, bevelled-edged tablet, marked with > on one side and scored with "AN" over "50" on the other side.
You will find info on atenolol at https://www.drugs.com/atenolol.html
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