(N‐Nitroso‐(RS)‐1‐[(RS)‐6‐fluorochroman‐2‐yl]‐2‐({(RS)‐2‐[(SR)‐6‐fluorochroman‐2‐yl]‐2‐hydroxyethyl}amino)ethan‐1‐ol); N,N-Bis(2-(6-fluorochroman-2-yl)-2-hydroxyethyl)nitrous amide