1-Methyl-4H-3,1-benzoxazine-2,4(1H)dione

In its crystal structure, the title compound, C9H7NO3, forms π-stacked dimers, with a centroid–centroid distance of 3.475 (5) Å between the benzenoid and the 2,4 dicarbonyl oxazine rings. These dimers then form staircase-like linear chains through further π-stacking between the benzenoid rings [centroid–centroid distance of 3.761 (2) Å]. The methyl-H atoms are disordered due to rotation about the C—N bond and were modeled with equal occupancy

Methyl 2-acetamido-2-(1-acetyl-3-hydr­oxy-2-oxoindolin-3-yl)propanoate

In the title isatin compound, C16H18N2O6, the pyrrolidine ring adopts an envelope conformation and is inclined at a dihedral angle of 7.31 (5)° with respect to the benzene ring. The acetyl group is disordered over two positions with refined occupancies of 0.503 (4) and 0.497 (4). These groups make dihedral angles of 12.6 (6) and 19.6 (7)° with the pyrrolidine ring. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds link neighbouring mol­ecules into infinite chains along the b axis. These chains are further inter­connected by inter­molecular O—H⋯O hydrogen bonds into two-dimensional arrays parallel to the bc plane. Weak inter­molecular C—H⋯π inter­actions further stabilize the crystal structure