Absorption (λ max abs ) and emission (λ max flu ) maxima of photocage 3 and caged molecule 6 were determined (Figure ). The results were comparable, giving absorption maxima around 450 nm and emission maxima around 550 nm. Thus, compared to the DEACM photocage, a significant red-shift is achieved that is potentially beneficial for in vivo uncaging experiments. We next investigated uncaging of 6 in aqueous solution by performing a photolysis study with a LED setup.