Robuta

https://webbook.nist.gov/cgi/inchi/InChI%3D1S/C15H26O/c1-10-5-6-13-12(10)9-11-7-8-15(13%2C4)16-14(11%2C2)3/h10-13H%2C5-9H2%2C1-4H3/t10%3F%2C11-%2C12%3F%2C13%3F%2C15%3F/m0/s1 Isokessane