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.