Synonyms: 1H-7,9a-Methanobenz[a]azulene-1,10-dicarboxylicacid, 4,4a,4b,5,6,7,8,9,10,10a-decahydro-4a-hydroxy-1-methyl-8-methylene-,1,4a-lactone (7CI); 4aa,4bb-Gibb-2-ene-1a,10b-dicarboxylic acid, 4a-hydroxy-1-methyl-8-methylene-,1,4a-lactone (8CI); 4a,1-(Epoxymethano)-7,9a-methanobenz[a]azulene,gibb-2-ene-1,10-dicarboxylic acid deriv.