Dioscorine is one of few alkaloids to possess an isolated isoquinuclide nucleus that is not part of a condensed ring system, unlike catharanthine or other indole alkaloids.
2.
The residue from the distillation of high-temperature coal tar, primarily a complex mixture of three or more membered condensed ring aromatic hydrocarbons, was listed on 28 October 2008 as a substance of very high concern by the European Chemicals Agency.
मोबाइल