This imidazoyl urea, also known as 1,1'-carbonylbis-1h-imidazole, presents as a white to slightly pale-yellow crystalline powder. Store in a refrigerator, under inert gas and protected from moisture. This substance is heat sensitive and moisture sensitive. 1,1'-Carbonyldiimidazole is incompatible with oxidizing agents and strong acids and should not be stored or handled near them. This chemical is harmful if swallowed and causes severe skin burns and eye damage.