1-piperidin-1-ylhexane-1,4-dione

1-(2,4-dinitrophenyl)-1-oxidopiperidin-1-ium

1-piperidin-1-yloctan-2-one

1,5-diphenyl-5-piperidin-1-ylpent-1-en-3-one

2-piperidin-1-yl-2-pyridin-4-ylacetonitrile