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. 2022 Mar 18;11(6):809. doi: 10.3390/plants11060809

Figure 8.

Figure 8

Fragmentation pattern of A-type and B-type procyanidin dimers showing the product ions formed by quinone methide (QM), heterocyclic ring fission (HRF), and Retro-Diels Alder (RDA) fragmentation. Key ions highlighted in red.