2H-2,4a-Methanonaphthalen-6(5H)-one, hexahydro-1,1,5,5-tetramethyl- 67952-58-3 EINECS 267-912-0 Hexahydro-1,1,5,5-tetramethyl-2H-2,4a-methanonaphthalen-6(5H)-one