2,2,7,7-Tetramethyltricyclo(6.2.1.0(1,6))-undecan-4-one 67999-55-7 7H-2,4a-Methanonaphthalen-7-one, octahydro-1,1,5,5-tetramethyl- EINECS 268-064-4 Octahydro-1,1,5,5-tetramethyl-7H-2,4a-methanonaphthalen-7-one