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7,12-dimetilbenzo[a]antraceno
9,10-dimethylanthracene

n-terc-butil-n′-(4-etilbenzoíl)-3,5-dimetilbenzo-hidrazida
n-tert-butyl-n′-(4-ethylbenzoyl)-3,5-dimethylbenzohydrazide

n’-[(4-acetilfenil)carbonil]-n-terc-butil-3,5-dimetilbenzo-hidrazida.
n'-[(4-acetylphenyl)carbonyl]-n-tert-butyl-3,5-dimethylbenzohydrazide.

se essa substância for utilizada, cada lote s9 deve ser igualmente caracterizado com um agente mutagénico que exija activação metabólica por enzimas microssómicos, como por exemplo o benzo[a]pireno ou o dimetilbenzo[a]an-traceno.
if 2-aminoanthracene is used, each batch of s9 should also be characterised with a mutagen that requires metabolic activation by microsomal enzymes, e.g. benzo[a]pyrene, dimethylbenzanthracene.