Methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate (DuPont Fungicide 1991) 
Analysis of composite urine samples from rats fed DuPont fungicide 
1991 (1) was performed. Methyl 5-hydroxy-2-benzimidazolecarbamate (II) 
was found after enzyme hydrolysis to liberate glucuronide and/or sulfate 
conjugates. It was not determined whether hydroxylation occurred prior to 
or after loss of the butylcarbamoyl group (1733). 
a as 
H H 
HO- ai -C-OC 3 
A 
é 
Yi 
# 
4 
; 
O=C-NH-C4Hg 

y 
}-NH-C-OCH, 
\% 
249 
