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(A) Crystal structure of 5a confirming the oxadiazole-4N-oxide ring configuration. (B) HPLC-PDA analysis demonstrating differences in relative polarity and UV absorption properties for ODZ-2N and ODZ-4N furoxans 4a and 5a, respectively. Chromatograms represent overlay of UV signal at 254 nm with PDA analysis of the representative portion of the chromatogram shown above each peak.
