1-Propargyl-5-fluoropyrimidin-2-one 2(1H)-Pyrimidinone, 5-fluoro-1-(2-propynyl)- 5-24-02-00064 (Beilstein Handbook Reference) 5-Fluoro-1-(2-propynyl)-2(1H)-pyrimidinone 63331-27-1 BRN 0639921 NY 3184