IT has recently been reported 1 that β-acetylacrylic acid and its (ethyl) ester are rather poisonous to mice, about 1 mgm. given subcutaneously to a 25-gm. mouse being lethal. There was also an ...

N-carbobenzoxy-glycyl-cysteine ethyl ester. The use of another protecting unit easily removed by hydrolysis in combination with the carbobenzoxy method would considerably extend the use of the latter.

and two carbon atoms in the parent alcohol (ethanol). This ester is called ethyl butanoate. The names and structures of some other esters are shown below.