(4aS-trans)-3,4,4a,5,8,9,10,10a-Octahydro-1,4a-dimethyl-7-(1-methylethyl)-5,8-dioxo-2-phenanthrenecarboxylic acid 142950-86-5 2-Phenanthrenecarboxylic acid, 3,4,4a,5,8,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)-5,8-dioxo-, (4aS-trans)- Tryptoquinone A