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Robuta

https://webbook.nist.gov/cgi/inchi/InChI%3D1S/C10H16/c1-2-3-4-7-10-8-5-6-9-10/h2%2C7H%2C1%2C3-6%2C8-9H2 Cyclopentane, 4-pentenylidene cyclopentane