Pergolide mesyl­ate form II

A new polymorph of pergolide mesyl­ate or 8β-[(methyl­sul­fan­yl)­methyl]-6-propyl­ergoline methane­sulfonate, C₁₉H₂₇N₂S⁺·CH₃SO₃⁻, is reported. Pergolide mesyl­ate form II crystallizes in the trigonal system, which is unique for ergot derivatives. Although the hydrogen-bond system in form II differs completely from that in form I, the conformation of the pergolide moiety in various related structures is very similar.