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DescriptionCyclobutene ring opening.jpg
English: Electrocyclic ring opening of cyclobutene, with HOMO/LUMO changes.
{{Information |Description={{en|1=Electrocyclic ring opening of cyclobutene, with HOMO/LUMO changes.}} |Source=Own work by uploader |Author=Mmurali13 |Date=2009-04-27 |Permission=own work not published elsewhere |other_versions= }} <!-