The molecule is an ammonium ion resulting from the protonation of the piperidine nitrogen of pergolide. It is a conjugate acid of a pergolide.
(6aR,9R,10aR)-9-(methylsulfanylmethyl)-7-propyl-4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg]quinolin-7-ium