4H-Dibenzo(de,g)quinoline-1,9-diol, 5,6,6a,7-tetrahydro-2,10-dimethoxy-6-methyl-, (S)-, mixt. with (S)-5,6,6a,7-tetrahydro-2,9-dimethoxy-6-methyl-4H-dibenzo(de,g)quinoline-1,10-diol 79979-14-9 Isotheoline