2-(3 4-dihydroxyphenyl)-3 5 7-trihydroxy-4h-chromen-4-one July 8, 2019 16 32 64 128 2-(2 4-dihydroxyphenyl)-3 5 7-trihydroxy-4h-chromen-4-one 3 5 7-trihydroxy-2-(4-hydroxyphenyl)-4h-chromen-4-one 5 7-dihydroxy-2-phenyl-4h-chromen-4-one 3 5 7-trihydroxy-2-phenyl-4h-chromen-4-one