3b,4,4a,7b,8,8a-Hexahydropyreno(4,5-b:9,10-b')bisazirine 80984-66-3 BRN 4510442 CCRIS 5708 Pyrene-1,2:6,7-bisimine Pyreno(4,5-b:9,10-b')bisazirine, 3b,4,4a,7b,8,8a-hexahydro-