Does anyone think about Dimethylmercury?

[CrimsonPeace]

(CH3)2Hg feels poetic to me almost, couple drops on the skin and you have a timer until you die. By the time you show symptoms no one can do anything about it, it almost turns suicide into more of what someone experiences when they receive a terminal diagnosis. It may even be more ethical for the people around you as you will still live for while after you show symptoms and get diagnosed, they have time to process and say goodbye. I don't know it feels so poetic, yet is a bad idea due to the environmental hazard you'd create. Is there anything similar that is not too difficult to create and has that longer time until death? I don't mind painful deaths.