1,3,4,6,7,8a-Hexahydro-1,1,5,5-tetramethyl-2H-2,4a-methanonaphthalen-8(5H)-one 2,2,7,7-Tetramethyltricyclo(6.2.1.0(1,6))-undecan-5-one 23787-90-8 2H-2,4a-Methanonaphthalen-8(5H)-one, 1,3,4,6,7,8a-hexahydro-1,1,5,5-tetramethyl- 2H-2,4a-Methanonaphthalen-8(5H)-one, hexahydro-1,1,5,5-tetramethyl-, (2alpha,4aalpha,8abeta)- 33407-62-4 EINECS 245-890-3 Isolongifolanone Isolongifolene ketone