9EST:
reference: Structural study of porcine pancreatic elastase complexed with 7-amino-3-(2-bromoethoxy)-4-chloroisocoumarin as a nonreactivatable doubly covalent enzyme-inhibitor complex., Vijayalakshmi J, Meyer EF Jr, Kam CM, Powers JC, Biochemistry 1991 Feb 26;30(8):2175-83. PMID: 1998677

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