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