1,2,6,7,8,9,10,11-Octahydro-1,6-dimethyl-10,11-dioxophenanthro(1,2-b)furan-6-carboxaldehyde 142694-58-4 Phenanthro(1,2-b)furan-6-carboxaldehyde, 1,2,6,7,8,9,10,11-octahydro-1,6-dimethyl-10,11-dioxo- Tanshinaldehyde