The molecule is an ammonium ion resulting from the addition of a proton to the piperazine nitrogen that is not attached to the pyrimidinyl group. The major species at pH 7.3. It is a conjugate acid of a buspirone.
8-[4-(4-pyrimidin-2-ylpiperazin-1-ium-1-yl)butyl]-8-azaspiro[4.5]decane-7,9-dione