Ko te Acetaldehyde e mohiotia ana he ethanal, he puhui matū waro me te tauira CH3CHO, i etahi wa ka whakapotohia e nga tohunga kemu ko MeCHO (Me = methyl).He wai kore tae, hau hau ranei, e koropupu tata ana ki te pāmahana rūma.Koia tetahi o nga aldehydes tino nui, ka puta whanui i roto i te taiao me te whakaputa i runga i te tauine nui i roto i te umanga.