[sally]

Hi
In the article they synthesized compound 1, but they found discrepancies between NMR data of the synthetic compound and those of the natural product. For comparison they synthesized its natural 3'-O-methyl isomer 2 which has been isolated from flowers of crocus species. finally the nature product from C. spicatus is revised to structure 2.
the compounds were extracted with aqueous acetonitrile containing 0.5% trifluoroacetic acid
I would appreciate your help in understanding why and how isomer 1 is revised to isomer 2.
Thank you

[movies]

It sounds like the chemists who first isolated the compound just assigned the structure wrong.  It's fairly common.  This is a good example of why natural product synthesis is still an important tool for structure determination!