3 9-ethylidene-2 4 8 10-tetraoxaspiro 5.5 undecane July 8, 2019 16 32 64 128 2 4 8 10-tetraoxaspiro 5.5 undecane 3 9-diethylidene-2 4 8 10-tetraoxaspiro 5.5 undecane
