produced by Claviceps purpurea
(ergot fungus) containing a lysergic acid
fragment N linked to some sort of piperazine derivative(a sort of dicyclo[1,2-df]piperazine:
Apparently, some people (perhaps those living in Slovenia or Hungary, who recieved 924 and 68 kilograms respectively from the US in 1999/2000 - but not as much as the 1,800 kg sold to Mexico. Source: ita.doc.gov) use it to cure migrane, though I'm sure it's one of those 'miracle drugs'.