2 6 9 10 7 July 8, 2019 16 32 64 128 2 3 6 7-tetramethoxy-9 10-dimethylanthracene 2 3 6 7 tetrahydroxy 9 10 anthraquinone 9 7 x 2 6 10 3 7t 2 )+ 9 6 3t 10
