2-Butenoicacid, 2-methyl-,9,10-dihydro-9-hydroxy-8,8-dimethyl-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran-10-ylester, [9R-[9a,10a(E)]]-;2H,8H-Benzo[1,2-b:3,4-b']dipyran, 2-butenoic acid deriv.; Qianhucoumarin A;Quianhucoumarin A
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