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Negative ion ESI-MS/MS spector for (a) IIred and (b) II′red. Both compounds fragment identically, a finding consistent with their assignment as the diastereomers of 1-(3,5-di-O-Ac-2-deoxy-β-d-erythro-pentofuranosyl)-3-(2-imino-5-oxo-imidazolidin-4-yl)urea.
