1,1,5-Trimethylfuro[3,4-c]pyridine-3,4(1H,5H)-dione AIDS-143627 AIDS143627 Cerpegin NSC664901 {3,4-Dioxo-1,1,5-trimethyl-1,3,4,5-tetrahydrofuro-[3,} 4-c\]-pyridine