1,3,3-trimethylbicyclo[2.2.1]heptan-2-one 1195-79-5 FENCHONE InChI=1/C10H16O/c1-9(2)7-4-5-10(3,6-7)8(9)11/h7H,4-6H2,1-3H bicyclo[2.2.1]heptan-2-one, 1,3,3-trimethyl-