2,5-Methanocyclohexanone 2-Norbornanone 2-Oxonorbornane 22270-13-9 497-38-1 8,9,10-Trinorbornan-2-one AI3-51353 Bicyclo(2.2.1)heptan-2-one EINECS 207-846-1 NORCAMPHOR NSC 66537 Norcampher