Successful functionalization with dansylcadaverine is evidenced by the two most intense signals in the MS at m/z = 3668 and 3683, which can be attributed to the desired product ionized with Na + (α) and K + (β), respectively, featuring an amine ω-terminus. The weaker γ and δ distributions can be attributed to residual PSar and PSaroxid bearing potassium ion doping, respectively (Figure ).