1-tert-butyl-3-(2-pyridin-3-ylpyrimidin-4-yl)urea

1-tert-butyl-3-(5-methyl-2-pyridin-4-ylpyrimidin-4-yl)urea

1-tert-butyl-3-(2-pyridin-2-ylpyrimidin-4-yl)urea

N-tert-butyl-2-pyridin-4-ylpyrimidin-4-amine

(2,5-dioxopyrrolidin-1-yl) N-tert-butylcarbamate