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Possible structure and MS/MS fragmentation pathway of novel CP compounds 8 (a,c) and 9 (b,d). The site of deprotonation in [M–H]− was randomly selected, and RDA is short for Retro-Diels-Alder fragmentation. The precursor or parent ions are present in the box, and the dotted lines with different color represent different ways of fragmentation. The position of the rhamnosyl group of the compound 9 in (b) and (d) was randomly selected among C2″, C3″ and C4″.
