2-Butenoicacid, 2-methyl-,9,10-dihydro-8,8-dimethyl-10-(3-methyl-1-oxobutoxy)-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran-9-ylester, [9S-[9a(Z),10a]]-;2H,8H-Benzo[1,2-b:3,4-b']dipyran, 2-butenoic acid deriv.; Praeruptorin E
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