2-Butenoicacid, 3-methyl-, 7,8-dihydro-6-hydroxy-8,8-dimethyl-2-oxo-2H,6H-benzo[1,2-b:5,4-b']dipyran-7-ylester, (6S-trans)-; 2H,6H-Benzo[1,2-b:5,4-b']dipyran, 2-butenoic acid deriv.;Pd-C-I
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