19398-83-5;2826-19-9;4,7-Methano-1H-indene, 2,3,3a,4,7,7a-hexahydro-;2,3,3a,4,7,7a-Hexahydro-4,7-methano-1H-indene;EINECS 243-033-8;2,3-Dihydro-endo-dicyclopentadiene;4,7-Methano-1H-indene, 1,2,3a,4,7,7a-hexahydro-, (3aR,4S,7R,7aS)-rel-