1 JRO 6,7,9-trihydroxy-3-methyl-1h-benzo[G]isochromen-1-one 1.000 2 EMO 3-methyl-1,6,8-trihydroxyanthraquinone 0.773 3 9TF Purpurin 0.727 4 B0E 1,3-bis(oxidanyl)benzo[C]chromen-6-one 0.714