SHAZ by synthesis from spirohydantoin and bis (2-chloroethy1)-amine. The metabolite and synthetic SHAZ cochromatographed in the solvent systems listed above. The mutagenicity of a sample of TLC-isolated metabolite and synthetic SHAZ was determined using Salmonella typhimurium strain TA1535 and a plate incorporation assay in the absence of S9. 4 The results are shown in Table I.