2-[(3S)-5-Oxooxolan-3-yl]isoindoline-1,3-dione

The oxolan-2-one ring in the title compound, C₁₂H₉NO₄, has an envelope conformation with the atom linking the two five-membered rings being the flap atom.

3a,11b-Dihy­droxy-3a,11b-dihydro-1H-imidazo[4,5-f][1,10]phenanthroline-2(3H)-thione

The title compound, C₁₃H₁₀N₄O₂S, was prepared through a cyclization reaction of 1,10-phenanthroline-5,6-dione and thio­urea. The dihedral angle between the pyridine rings is 8.22 (2)°. In the crystal, mol­ecules are connected by N—H...O, O—H...N, N—H...S and O—H...S hydrogen bonds, forming a three-dimensional network.