methyl 3-(3-methyl-5-oxo-1,2-dihydropyrrol-4-yl)propanoate

dimethyl 4-nitropyrazole-3,5-dicarboxylate

methyl 3-(5-hexyl-4,5-dihydro-1,2-oxazol-3-yl)propanoate

methyl 4-nitro-5-oxoundecanoate

methyl 5-hydroxy-4-nitroheptanoate