.alpha.-Pyracin 4543-56-0 7-Hydroxy-6-methylfuro[3,4-c]pyridin-3(1H)-one AIDS-124182 AIDS124182 NSC15983 Pyracin-5 Pyridoxic acid .gamma.-lactone Pyridoxic acid, .gamma.-lactone {Furo[3,4-c]pyridin-3(1H)-one,} 7-hydroxy-6-methyl-