(2R,8aβ)-Hexahydro-1,1,5,5-tetramethyl-2H-2β,4aβ-methanonaphthalen-8(5H)-one

(2R,4aR,8aR)-1,3,4,6,7,8a-Hexahydro-1,1,5,5-tetramethyl-2H-2,4a-methanonaphthalene-8(5H)-one