(mg(UnderBar[(Subscript[TMPO, 4])])mg   sample )×(258.68   MW(UnderBar[product])140.08   MW(Subscript[TMPO, 4]))×((^31)P   NMR(UnderBar[integration   product])(^31)P   NMRintegration   (Subscript[TMPO, 4]))×100=(%   potency(w/w )  of   theproduct   oil)