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The extracted ion chromatograms (A) and MS/MS spectra of LPV_hydrazone_1 (B), 2 (C), and 3 (D). Three LPV hydrazones (LPV_hydrazone_1, 2, and 3) were detected in the incubation of LPV in HLM containing semicarbazide. All samples were analyzed by UPLC-TOFMS. Major daughter ions from fragmentation were interpreted in the inlaid structural diagrams.
