2ZC5:
reference: Crystal structures of biapenem and tebipenem complexed with penicillin-binding proteins 2X and 1A from Streptococcus pneumoniae., Yamada M, Watanabe T, Baba N, Takeuchi Y, Ohsawa F, Gomi S, Antimicrob Agents Chemother. 2008 Jun;52(6):2053-60. Epub 2008 Apr 7. PMID: 18391040

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