1 HNF 7-nitro-9h-fluoren-2-ol 1.000 2 4HB 4,4'-dihydroxybiphenyl 0.722 3 AF 2-aminofluorene 0.722 4 BP7 1,1'-biphenyl-3,4-diol 0.722 5 BNL Biphenyl 0.706