2-Butyl-4,6-dihydroxy-3-methyl-2,3-dihydro-1H-pyrrolo[3,4-c]pyridin-1-one 2-n-Butyl-6-hydroxy-3-methyl-1,4-dioxo-2,3,4,5-tetrahydro {-1H-pyrrolo[3,4-c]pyridine} AIDS-139760 AIDS139760 NSC649766