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(A) Positive ion electrospray ionization mass spectrometry (ESI-MS) spectrum of 1. (B) Tandem mass spectrometry (ESI-MS/MS) spectrum of 1 for the parent ion at m/z 228. (C) The structure of product 1, 2,5-diimino-4-[(2-deoxy-β-d-erythro-pentofuranosyl)amino]-2H,5H-imidazole (dDiz).
