Spiroiminodihydantoin nucleoside formation from 2'-deoxyguanosine oxidation by [`ANTPOT. 18 O'-labeled] singlet molecular oxygen in aqueous solution - Martinez, Glaucia Regina; Ravanat, Jean-Luc; Cadet, Jean; Medeiros, Marisa Helena Gennari de; Di Mascio, Paolo (Journal of Mass Spectrometry, 2007)