Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/2LK3 2LK3: U2/U6 Helix I RNA (5'-R(*GP*GP*CP*UP*UP*AP*GP*AP*UP*CP*AP*GP*AP*AP*AP*UP*GP*AP*UP*CP*AP*GP*CP*C)-3') helix