Vrantza D, Kaloudis P, Leondiadis L, Gimisis T, Vougioukalakis GC, Orfanopoulos M, Gasparutto D, Cadet J, Encinas S, Paris C, et al. {Modification of Guanine with PhotolabileN-Hydroxypyridine-2(1H)-thione: Monomer Synthesis, Oligonucleotide Elaboration, and Photochemical Studies}. Helv. Chim. Acta [Internet]. 2006;89:2371?2386.