Robuta

https://webbook.nist.gov/cgi/cbook.cgi?ID=R633864&Mask=2 1-cis-3-Ethylmethylcyclopentane cis https://webbook.nist.gov/cgi/cbook.cgi?ID=R320484&Mask=2 cis-1,3-ethylmethylcyclopentane cis