Fig. 7

a HPLC-DAD chromatogram of the DMSO extract of sample P.26 (“Laque de Garance Rxo 2783 nouvelle”), acquired 275 nm; b DAD spectrum and tandem mass spectrum of the chromatographic peak assigned to PR84. The tandem mass spectrum refers to the parent ion at m/z = 335.0 ± 0.7, fragmented at 30 V; c DAD spectrum and tandem mass spectrum of the chromatographic peak assigned to the imine form of PR84. The tandem mass spectrum refers to the parent ion at m/z = 334.0 ± 0.7, fragmented at 30 V