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An alkaloid 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:

N12[C@@(O[C@@(C)]C1)][C@@H](CCC3)N3C(=O)[C2@@H](C) ).

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'.