1,2-Dihydroacenaphthylene 1,8-Dihydroacenaphthalene 1,8-Ethylenenaphthalene 83-32-9 ACENAPHTHENE AI3-00128 Acenaphthylene, 1,2-dihydro- CCRIS 5951 EINECS 201-469-6 Ethylenenaphthalene HSDB 2659 NSC 7657 Naphthyleneethylene peri-Ethylenenaphthalene