ethyl 2-[2-(dicyanomethylidene)-4-hydroxy-1,3-dithiolan-4-yl]acetate

ethyl (2E)-2-cyano-2-[4-(2-ethoxy-2-oxoethyl)-1,3-dithiol-2-ylidene]acetate

ethyl 3-(3-amino-4-cyano-5-methylsulfanylthiophen-2-yl)-3-oxopropanoate

ethyl 2-(3-benzyl-2-sulfanylidene-1,3-thiazol-4-yl)acetate

ethyl 2-(3-methyl-2-sulfanylidene-1,3-thiazol-4-yl)acetate