(a)
(b)
Figure 1: (a) Chemical structure of trans-resveratrol. (b) The structure of the metabolites of resveratrol: (1) R1 = sulfate, R2 = H: resveratrol-3-O-sulfate, (2) R1 = H, R2 = glucuronide: resveratrol-4′-O-glucuronide, and (3) R1 = glucuronide, R2 = H: resveratrol-3-O-glucuronide.