Pentosan (C5H6Na2O10S2)n I believe that this is the current iPPS...

Pentosan (C₅H₆Na₂O₁₀S₂)_{n I believe that this is the current iPPS of PAR}

Fibrase C₂₉H₃₈Na₁₀O₅₀S₉

Various brand names include Elmiron (as sodium salt), Hemoclar, Anarthron, Fibrase, Fibrocid, Thrombocid and SP54. PPS capsules are sold in India under the brand names Comfora, Pentossan-100, Cystopen and For-IC. In the veterinary field, pentosan polysulfate is sold as Cartrophen Vet and Sylvet by Biopharm Australia, Pentosan by Naturevet Australia, Anarthron by Randlab Australia and Zydax by Parnell.

Elmiron papers

https://www.accessdata.fda.gov/drugsatfda_docs/label/2008/020193s007lbl.pdf