1,2,3,6-四氢吡啶

N-cyanoacetyl-1,2,3,6-tetrahydropyridine

6-(3,6-dihydro-2H-pyridin-1-yl)-3-hydroxy-2-iminopyrimidin-4-amine

dimethyl 4-chloro-2,6-bis(methoxycarbonylamino)pyrimidine 1-oxide

5-amino-7-[3,6-dihydro-1(2H)-pyridyl]-2H-[1,2,4]-oxadiazolo[2,3-c]pyrimidin-2-one