Nuclear magnetic resonance (NMR) spectra were recorded on a 500-MHz ECA500 NMR spectrometer (JEOL Ltd., Tokyo, Japan) at 293 K. The NMR chemical shifts 1H and 13C were referenced to the solvent peaks: δH 3.30 and δC 49.0 for CD3OD (Eurisotop, Saint-Aubin, France). High-resolution electrospray ionization mass spectrometry (HRESIMS) analysis was performed using UPLC-SYNAPT G2 HDMS (Waters, Milford, MA, United States).
Tenuazonic acid (compound 1): 1H and 13C NMR data – see Supplementary Table S1; HRESIMS m/z: [M + H]+; calculated for C10H16NO3 198.1130, result was 198.1127.
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