This Loftus report mentions phosphorus pentasulfate, which could be Phosphorus Pentasulfide you have posted about below.
2002 Document: Request for Precursor That Can Be Used To Make VX Nerve Gas (Translation)
Just a side note. Mr. Loftus used some of my translations. A gentlemen called Ryan Mauro asked me to give him the important translations that I made so he will give it to Mr. Loftus.