6BFH:
reference: Aminoglycoside resistance profile and structural architecture of the aminoglycoside acetyltransferase AAC(6')-Im., Smith CA, Bhattacharya M, Toth M, Stewart NK, Vakulenko SB, Microb Cell. 2017 Nov 9;4(12):402-410. doi: 10.15698/mic2017.12.602. PMID: 29234669

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