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Identification of the reaction product from OMA catalyzed by LigJ. (A) Negative-ion ESI-MS spectrum of OMA. The peak at m/z 201 was assigned to the deprotonated molecular ion [M-H]− of OMA. (B) Negative-ion ESI-MS spectrum of the reaction product generated from OMA catalyzed by purified LigJ. The peak at m/z 201 derived from OMA reduced, and the generation of the product peak at m/z 219 was observed.
