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UV spectra of (a) 4’HF; (b) 4’H7M; (c) 5,4’DHF; and (d) 3,6,4’THF (solid black line) and their 4’-O-glucuronides (green dotted line) generated by either UGT1A1, 1A7, 1A8, 1A9, or 1A10 at an incubation concentration of 10 or 25 µM.