ethyl 3-amino-4-cyano-5-(2-ethoxy-2-oxoethyl)sulfanylthiophene-2-carboxylate

ethyl 2-pyrazolo[3,4-b]pyridin-1-ylacetate

ethyl 4-oxo-3-pent-4-enoyloct-7-enoate

diethyl 3,3-di(pent-4-enoyl)pentanedioate

ethyl 2-(4-fluoro-1H-indol-3-yl)acetate