(-)-3,4-Dihydroxy-2-(3,4-dihydroxyphenyl)-5-(4-hydroxyphenyl)-2-cyclopenten-1-one;Involutin;(4S)-2-(4-Hydroxyphenyl)-3,4β-dihydroxy-5β-(3,4-dihydroxyphenyl)-2-cyclopentene-1-one;5β-(3,4-Dihydroxyphenyl)-3,4β-dihydroxy-2-(4-hydroxyphenyl)-2-cyclopenten-1-one
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