Keywords: 2-Methyl-but-2-en.svg de chem Struktur von 2-Methyl-but-2-en ein Penten own made 2008-01-25 <br/> original text 1 25 01 2008 Roland chem original upload log de wikipedia Man77 CommonsHelper page de wikipedia 2-Methyl-but-2-en svg 2008-01-25 12 51 Roland chem 55×48× 3246 bytes <nowiki> Andere Versionen </nowiki> Pentenes |