We mainly study stable molecular geometries and atomic charge distributing of 5-methoxy indole 5-methyl indole and 5-chlorin indole.

In addition, some organic acids with the bad breath, such as butyric acid and propionic acid, and indole, methyl indole compounds and cadaverine.

And color stability of diesel fuel were affected by unsaturated hydrocarbon, alkyl indole, methyl - carbazole, aniline and phenol.