Also Called: 2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-diethanol, .beta.3,.beta.3,.beta.9,.beta.9-tetramethyl-;2,4,8,10-tetraoxaspiro[5,5]undecane-3,9-diethanol,β3,β3,β9,β9-tetramethyl-(''SPG');3,9-bis(1,1-dimethyl-2-hydroxy ethyl)-2,4,8,10-tetraoxaspiro[5,5]undecane;2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-diethanol, β3,β3,β9,β9-tetramethyl-;2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-diethanol, β,β,β',β'-tetramethyl-;3,9-Bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane;2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-dimethanol, β,β,β',β'-tetramethyl-;2,4,8,10-tetraoxaspiro[5,5]undecane-3,9-diethanol,β3,β3,β9,β9-tetramethyl-(''SPG'');2,4,8,10-tetraoxaspiro[5.5]undekan-3,9-dietanol,β3,β3,β9,β9-tetrametyl- (''SPG'')