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Product-ion spectrum generated by CID of [M+H]+ m/z 261 of SP203 and proposed structure (inset) of adduct-ion m/z 273 formed by addition of methanol to m/z 241 ion (R = 3-fluoro-5-cyanophenyl). The methanol-adduct formation provided additional proof for the site of glutathione conjugation in SP203Glu
