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MALDI-TOF mass spectra of cyclophosphamide and cytosine β-D-arabinofuranoside on graphene. The peaks at m/z 283 and 266 correspond to the [M+Na]+ ions of cyclophosphamide and cytosine β-D-arabinofuranoside, respectively: (a) sample in water solution; (b) sample in 500 mM NaCl solution.
