6,10-Dibenzyl-N,N'-dimethyl-N,N,N',N'-tetrakis(4-methylbenzyl)-1,4-dioxaspiro[4.5]decane-(2R,3R)-diylbis(methylammonium) Bis(tetrafluoroborate) [=(R,R)-TaDiAS-2nd]6,10-二苄基-N,N'-二甲基-N,N,N',N'-四(4-甲基苄基)-1,4-二氧杂螺[4.5]癸烷-(2R,3R)-二基双(甲铵)双(四氟硼酸盐) [=(R,R)-TaDiAS-2nd]