5C0O:
reference: The m1A modification in eubacterial tRNA: An overview of tRNA recognition and mechanism of catalysis by TrmI., Degut C, Ponchon L, Folly-Klan M, Barraud P, Tisne C, Biophys Chem. 2015 Jul 15. pii: S0301-4622(15)30017-X. doi:, 10.1016/j.bpc.2015.06.012. PMID: 26189113

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).