Benzenepropanoic acid, .alpha.-[3-[5-(aminocarbonyl)-1H-imidiazol-4-yl]-2-triazenyl]-4-[bis(2-chloroethyl)amino]-, methyl ester, compd. with ethyl acetate (2:1) Hydrocinnamic acid, p-[bis(2-chloroethyl)amino-.alpha.-[3-(5(or 4)-carbamoylimidazol-4(or 5)-yl)-2-triazeno]-, methyl ester, compd. with ethyl acetate (2:1) NSC100862