Help ). From Wikipedia Metaldehyde is an organic compound with the formula (CH 3 CHO) 4 . It is commonly used as a pesticide against slug s, snail s, and other gastropod s. It is the cyclic tetramer of acetaldehyde . Read more... Edit at Wikipedia... Other names 2,4,6,8-Tetramethyl-1,3,5,7-tetroxocane (IUPAC Name);