1-Butyl-1a,9b-dihydro-1H-phenanthro(9,10-b)azirine 1H-Phenanthro(9,10-b)azirine, 1a,9b-dihydro-1-butyl- 64188-66-5 BRN 1580235 CCRIS 2134 N-Butylphenanthrene 9,10-imine N-n-Butylphenanthreneimine