several novel benzopyrene derivatives with the same gross structure and the same electronic periphery as benzo ( a ) pyrene , but with some alteration in the complete electronic structure , when tested in the ame 's salmonella/microsome test ( ta 1537 , ta 100 and ta 98 ] , were found to lack mutagenicity and , therefore , putative carcinogenicity .
C0005082
benzopyrene
C0005052
benzo ( a ) pyrene