1TQH:
reference: Covalent reaction intermediate revealed in crystal structure of the Geobacillus stearothermophilus carboxylesterase Est30., Liu P, Wang YF, Ewis HE, Abdelal AT, Lu CD, Harrison RW, Weber IT, J Mol Biol 2004 Sep 10;342(2):551-61. PMID: 15327954

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