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NMR spectra (700 MHz, CDCl3) of VAS (Cro013448) product. Top left and top right: sections of the 1H NMR spectrum. Bottom left: ROESY. Bottom right: HMBC. Strictosidine and vallesiachotamine numbering. The signal of 18‐CH3 (δ H=1.36 ppm) is not included in this figure. Ring D is indicated on the proposed chemical structure.
