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Selected HMBC correlations of 1: (a) from H-19 (δ 2.51) to C-20 (δ 122.4) and C-24 (δ 117.8) of the imidazole moiety. H-19 lies under the large DMSO peak (2.49 ppm). (b) from H-8′ (δ 6.83) 3J couplings to C-24 (δ 117.8) of the imidazole moiety, and to C-6′ (δ 149.6), C-10′ (δ 128.9) and a 2J coupling to C-9′ (δ 137.4) of the uranidine moiety.
