1	0QA	4-[methyl(nitroso)amino]-1-(pyridin-3-yl)butan-1-one	1.000
2	HNM	1-(6-hydroxypyridin-3-yl)-4-(methylamino)butan-1-one	0.812
3	PBO	1-pyridin-3-ylbutan-1-one	0.733