Keywords: 2-Methyl-but-1-en.svg de chem Struktur von 2-Methyl-but-1-en ein Penten own made 2008-01-25 <br/> original text 1 25 01 2008 Roland chem original upload log de wikipedia Hystrix CommonsHelper page de wikipedia 2-Methyl-but-1-en svg 2008-01-25 12 49 Roland chem 71×45× 3276 bytes <nowiki> Andere Versionen </nowiki> Pentenes |