1,2-Dihydro-cyclopenta(c,d)pyrene 2,3-Acepyrene 25732-74-5 3,4-Dihydrocyclopenta(cd)pyrene 3,4-Dimethylenepyrene BRN 1568292 CYCLOPENTA(cd)PYRENE, 3,4-DIHYDRO- Cyclopentano(c,d)pyrene