Spiro[benzofuran-2(3H),9'(8'H)-[2H]furo[2,3-h][1]benzopyran]-3-one,3',4'-dihydro-3',4,5',6-tetrahydroxy-2',8'-bis(4-hydroxyphenyl)-, [2'R-(2'a,3'b,8'a,9'a)]-; Genkwanol A
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