Tetramethylsuccinonitrile

Tetramethylsuccinonitrile or TMSN is a nitrile which is a very toxic and hazardous substance.

Physical properties
It is a colorless and odorless solid.

Biological hazards
Symptoms of large or short exposure to this substance include convulsions, dizziness, headache, nausea, vomiting or even unconsciousness, hence affects central nervous system.