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TOF-MS/MS spectra of [M − H]− ion of compounds (A) 11 and (B) 14. The structure of the main fragment ions is highlighted. The relative abundance of the ions [M − H-CO2]− and [M − H-CO2-C2H2O]−, as well as of ions from benzofuran-forming fission (BFF, in purple), heterocyclic ring fission (HRF, in blue), and retro Diels–Alder (RDA, in light orange) reactions allowed the geometrical isomers to be distinguished.
