2-(1-(Ethylsulfonyl)azetidin-3-ylidene)acetonitrile1187595-85-2100 % similar 1-(tert-Butoxycarbonyl)-3-(cyanomethylene)azetidine1153949-11-139 % similar 1-Ethylsulfonyl-piperazine62937-96-638 % similar 3-(Cyanomethylene)cyclobutanecarbonitrile1153949-98-432 % similar