Although not for SL327, I was doing a lit search on how to use DMSO to dissolve drugs. It seems that, for i.p.. most people recommend go as low as possible, 2 to 4%, and never more than 10%. I have worked once dissolving domperidone in pure DMSO and I can attest it was highly toxic, and made rats stink with the odour of the drug. Hope this helps.