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There is a page named "File:Pentaheptafulvalene.png" on Wikipedia
- DescriptionPentaheptafulvalene.png English: 7-Cyclopenta-2,4-dien-1-ylidenecyclohepta-1,3,5-triene Date 15 November 2016 Source Own work Author Zklbey...(1,510 × 870 (47 KB)) - 16:55, 6 October 2020