3ZKY:
reference: The Interaction of Isopenicillin N Synthase with Homologated Substrate Analogues delta-(L-alpha-Aminoadipoyl)-L-homocysteinyl-D-Xaa Characterised by Protein Crystallography., Daruzzaman A, Clifton IJ, Adlington RM, Baldwin JE, Rutledge PJ, Chembiochem. 2013 Mar 18;14(5):599-606. doi: 10.1002/cbic.201200728. Epub 2013, Mar 6. PMID: 23468426

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