.alpha. K5 B W12 O40 .alpha.-K5BT 11078-54-9 AIDS-001844 AIDS001844 Polyoxometalate(.a.K5BW12O40) Potassium tungstoborate (K5(BW12O40)) Tungstate(5-), tetracosa-.mu.-oxododecaoxo[.mu.12-[tetrahydroxyborato(5-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-, pentapotassium. Tungstoboric acid (H5BW12O40), (*Pentapotassium salt*)