6TFH:
reference: Structure and ligand binding of the ADP-binding domain of the NAD(+) riboswitch., Huang L, Wang J, Lilley DMJ, RNA. 2020 Jul;26(7):878-887. doi: 10.1261/rna.074898.120. Epub 2020 Apr 15. PMID: 32295864

This OCA Structure page
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