"Dimethylmercury ((CH3)2Hg) is an organomercury compound. This colorless liquid is one of the strongest 
known neurotoxins. It is described as having a slightly sweet smell, although inhaling enough vapor to detect its odor would be hazardous."
"It is a liquid at room temperature, with a faint sweet smell (not a good career move). It has a boiling point of 92°C at atmospheric pressure and a density of 2.96 g/cm3. It has a linear structure, like many HgX2 systems with Hg-C = 2.083 Å."