2-(1,3-Dioxolan-2-yl)-3-methyl-7-norbornanone dimethyl acetal 2-(2-Dioxolanyl)-3-methyl-7,7-dimethoxynorbornane 31969-71-8 7-Norbornanone, 2-(1,3-dioxolan-2-yl)-3-methyl-, dimethyl acetal