.alpha. and .beta.-H5BT 12297-12-0 131359-48-3 AIDS-001673 AIDS001673 BT H5 B W12 O40 Polyoxometalate H5 B W12 O40, A Keggin type polyoxometalate Tungstate(5-), tetracosa-m-oxododecaoxo[m12-[tetrahydroxyborato(5-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-, pentahydrogen Tungstoboric acid (H5W12BO40)