2,7-DIOXASPIRO(4.4)NONANE-1,6-DIONE, 3,8-BIS(1-PIPERIDINYLMETHYL)- 3,8-Bis(1-piperidinylmethyl)-2,7-dioxaspiro(4.4)nonane-1,6-dione 60012-89-7 BRN 1265551