(3E,5Z)-5-(3,3-Dimethyl-8,9,10-trinorborn-2-yliden)-3-penten-2-on 2226-11-1 3-Penten-2-one, 5-(3,3-dimethylbicyclo(2.2.1)hept-2-ylidene)- 5-(3,3-Dimethyl-2-norbornyliden)-3-penten-2-one 5-(3,3-Dimethyl-2-norbornylidene)-3-penten-2-one 5-(3,3-Dimethylbicyclo(2.2.1)hept-2-ylidene)-3-penten-2-one Bornelona [INN-Spanish] Bornelone Bornelone [USAN:INN] Bornelonum [INN-Latin] EINECS 218-757-2 UV Absorber-4