1-[2-(3-nitrophenyl)-5-pyridin-3-yl-2H-1,3,4-oxadiazol-3-yl]ethanone

1-[2-(4-nitrophenyl)-5-pyridin-3-yl-2H-1,3,4-oxadiazol-3-yl]ethanone

1-(2,2-dimethyl-5-pyridin-3-yl-1,3,4-oxadiazol-3-yl)ethanone

1-(2-ethyl-2-methyl-5-pyridin-3-yl-1,3,4-oxadiazol-3-yl)ethanone

1-(2-pyridin-3-yl-1-oxa-3,4-diazaspiro[4.5]dec-2-en-4-yl)ethanone