Selenophenol Link
The biggest stinker I have run across. . .Imagine 6 skunks wrapped in rubber innertubes and the whole thing is set ablaze. That might approach the metaphysical stench of this material.
Also known as things I have regrettably worked with. Every step of the chemistry sucked. Luckily, I spent so much time in lab, no one ever noticed that my skin and hair stunk for a couple of months. So when I see dapper scientists in nice white coats and perfect teeth, I known that it is mostly bullshit. A lot of basic science is done by smelly, unkempt, poorly dressed and often hung-over graduate students regularly sacrificing their wellbeing.