1,3-dimethyl-5-fluoro-6-azauracil and some 5-bromo-6-azauracil derivatives.
D002625:Chemistry, Organic; D007659:Ketones; D055601:Organic Chemistry Phenomena; D014227:Triazines; D014498:Uracil / Q000031:analogs & derivatives
D007659:Ketones; D014227:Triazines; D014498:Uracil