Thirty analogues of N 1-phenyl-3, 5-dinitro-N 4, N 4-di-n-propylsulfanilamide (GB-II-5, compound 3), a new antikinetoplastid antimitotic agent, have been synthesized and evaluated. The addition of simple functional groups to the N1 aromatic ring generally decreases antiparasitic and antimitotic potency, but placement of a dibutyl substituent at the N4 nitrogen to give N 1-phenyl-3, 5-dinitro-N 4, N 4-di-n-butylsulfanilamide (compound 35 ...