1,4,4-Alpha,8-alpha-tetrahydro-endo-1,4-methanonaphthalene-5,8-dione 1,4,4a,8a-Tetrahydro-1,4-methanonaphthalene-5,8-dione 1,4-Methanonaphthalene-5,8-dione, 1,4,4a,8a-tetrahydro- 1200-89-1 Cyclopentadienebenzoquinone NSC 25329