Synonyms: NSC149615;.alpha.-Heptacyclene;AC1L3FM4;NSC-149615;6b,12b,12c-Tetrahydrocyclobuta[1,2-a:3,4-a']diacenaphthylene;Cyclobuta[1,4-a']diacenaphthylene, 6b,6c,12b,12c-tetrahydro-;6b,6c,12b,12c-Tetrahydrocyclobuta(1,2-a:3,4-a')diacenaphthylene;Cyclobuta(1,2-a:3,4-a')diacenaphthylene, 6b,6c,12b,12c-tetrahydro-;14620-98-5;15065-28-8;7259-03-2;Cyclobuta(1,2-a:3,4-a')diacenaphthylene, 6b,6c,12b,12c-tetrahydro- (6balpha,6calpha,12balpha,12calpha)-;Cyclobuta(1,2-a:3,4-a')diacenaphthylene, 6b,6c,12b,12c-tetrahydro- (6balpha,6cbeta,12bbeta,12calpha)-;Cyclobuta[1,2,-a:3,4-a']diacenaphthalene, 6b,6c,12b,12c-tetrahydro-(6b.alpha.,6c.alpha.,12b.alpha.,12c.alpha)-;Cyclobuta[1,2-a:3,4-a']diacenaphthalene, 6b,6c,12b,12c-tetrahydro-(6b.alpha.,6c.beta.,12b.beta.,12c.alpha.)-;Cyclobuta[1,2-a:3,4-a']diacenaphthylene, 6b,6c,12b,12c-tetrahydro- (6b.alpha.,6c.alpha.,12b.alpha.,12c.alpha.)-;Cyclobuta[1,2-a:3,4-a']diacenaphthylene, 6b,6c,12b,12c-tetrahydro- (6b.alpha.,6c.beta.,12b.beta.,12c.alpha.)-