Synonyms: 11-Methylene pentacyclo[5.4.0.02,6.03,10.05,9]undecan-8-one;91632-94-9;11-Methylene pentacyclo(5.4.0.02,6.03,10.05,9)undecan-8-one;AC1L3QRI;11-Methylene pentacyclo[5.4.0.02,6.03,10.0<5,9]undecan-8-one;5-methylideneoctahydro-1H-2,4,1-(ethane[1,1,2]triyl)cyclobuta[cd]pentalen-7-one