3PBS:
reference: Structural basis for effectiveness of siderophore-conjugated monocarbams against clinically relevant strains of Pseudomonas aeruginosa., Han S, Zaniewski RP, Marr ES, Lacey BM, Tomaras AP, Evdokimov A, Miller JR, Shanmugasundaram V, Proc Natl Acad Sci U S A. 2010 Dec 6. PMID: 21135211

This OCA Structure page
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