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In the title mol­ecule, C 10 H 8 N 2 O 4 , the imidazolidine ring adopts a twisted conformation. In the crystal, the mol­ecules are linked  via  a pair of bifurcated inter­molecular O—H⋯O hydrogen bonds, forming an inversion dimer. The dimers are further linked  via  N—H⋯O hydrogen bonds into a tape along the  b  axis.

3a,8a-Dihydroxy-1,3,3a,8a-tetrahydroindeno[1,2-d]imidazole-2,8-dione