Cis-resveratrol absorption occurs in a spectral region that overlaps with transresveratrol absorption (Figure ). The maximum absorption peak of THP, dominated by excitation into S4, is largely blue shifted when compared to transand cis-resveratrol. However, it still significantly overlaps with trans-resveratrol absorption thanks to the shoulder of excitations into S1 to S3. Resveratrone has two absorption peaks in the region of interest, one red-shifted (S0→S1) and the other blue-shifted (S0→S4). The combined tails of these bands cause a strong absorption in the same spectral absorption region of trans-resveratrol. Therefore, all three derivatives can be excited in single-energy setups, initially tuned to excite trans-resveratrol.