Acrolein

[Sarah]

A limpid, colorless, highly volatile liquid, obtained by thedehydration of glycerin, or the destructive distillation of neutralfats containing glycerin. Its vapors are intensely irritating. Watts.

[Zipporah Schumaker]

a chemical substance with a strong, unpleasant smell that is used to make plastics

[Dorothey Allen]

A colourless, acrid, liquid aldehyde obtained by dehydration of glycerol, used for making plastics and as an aquatic herbicide.