The stock for this pharmacy chain has struggled mightily this year.With its stock trading at multiyear lows that have led to a nearly 12% dividend yield, Walgreens Boots Alliance (WBA 3.27%) has likely popped up on the radar of some value investors. As a result, some of them may be considering investing in the stock at these levels.Before making any decision on Walgreens, investors might want to look at five things regarding this company that could affect their choice.1. The stock is trading down 85% over t ...