6M1U:
reference: Mechanistic insights into m6A modification of U6 snRNA by human METTL16., Aoyama T, Yamashita S, Tomita K, Nucleic Acids Res. 2020 May 21;48(9):5157-5168. doi: 10.1093/nar/gkaa227. PMID: 32266935

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