N-[2-[cyclohexylcarbamoyl(nitroso)amino]ethyl]-3,4-dihydroxy-5-(6-oxo-3H-purin-9-yl)oxolane-2-carboxamide

N-[2-[cyclohexylcarbamoyl(nitroso)amino]ethyl]-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolane-2-carboxamide

N-[2-[cyclohexylcarbamoyl(nitroso)amino]ethyl]-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolane-2-carboxamide

N-[2-(cyclohexylcarbamoylamino)ethyl]-3,4-dihydroxy-5-(6-oxo-3H-purin-9-yl)oxolane-2-carboxamide

N-[2-(cyclohexylcarbamoylamino)ethyl]-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolane-2-carboxamide