Keywords: Cis-trans-2-Buten Fi.svg en Structure of cis- and trans-2-butene in Finnish fi Cis- ja trans-2-buteenin rakennekaavat Cis-trans-2-Buten svg 2009-03-17 17 50 UTC Cis-trans-2-Buten svg NEUROtiker derivative work Eetwartti <span class signature-talk >talk</span> Cis-trans-2-Buten svg subst LOCALMONTHABBREV subst LOCALYEAR Au</nowiki> Uploaded with derivativeFX Butylenes |