( )-3 3' 4' 5 7-pentahydroxyflavan July 8, 2019 16 32 64 128 (+)-3 3' 4' 5 7-pentahydroxyflavone (+)-3 3' 4' 5 7-pentahydroxyflavan 2' 3 4' 5 7-pentahydroxyflavone 2 3 4 5 6-pentahydroxyhexanal 3 4' 5 7-tetrahydroxyflavone