Report copyright - 1.2-Dimethyl-3,4-diisopropyl-cyclobutadien-eisentricarbony 1 ...zfn.mpdl.mpg.de/data/Reihe_B/26/ZNB-1971-26b-0765.pdf1.3-Dimethyl-2.4-diisopropyl vor, so würde durch die Kohlenstoff-Atome
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