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HPLC-DAD/ESI-MS analysis of UGT88B2 enzymatic products using kaempferol (1) as an aglycon acceptor. (A) HPLC chromatogram of 1 and enzyme products 1a−1f; (B) MS spectra of 1a−1f in negative or positive mode successively; (C) Structures of enzymatic products of 1.