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LC-MS/MS chromatogram monitoring CTXs [M + Na]+ as precursor and product ion of: (A) Reference material of CTXs: CTX1B (1), C-CTX1 (2), C-CTX1-Me (3), 52-epi-54-deoxyCTX1B (4), 54-deoxyCTX1B (5), 49-epiCTX3C (6), CTX3C (7), CTX4A (8), and CTX4B (9); (B) C-CTX1 (2) detected in an amberjack.
