Benzimidazolinone is an organic compound with the formula C6H4(NH)2CO.

Also classified as a heterocyclic compound it is a bicyclic urea.

The parent compound is prepared by the carbonylation of 1,2-diaminobenzene.

[2] Like other ureas, it engages in hydrogen bonding, yielding supramolecular structures.

For example 4-amino-2-benzimidazolinone condenses with diketene to give the acetoacetanilide, which undergoes diazo coupling with various aryldiazonium salts.