In the title compound, C9H9FO3, the dihedral angle between the carboxyl group and the benzene ring is 79.4 (3)°. In the crystal, mol­ecules form centrosymmetric dimers through pairs of classical O—H⋯O hydrogen bonds. These are further linked by weaker C—H⋯O inter­actions, forming a three-dimensional network.

The title mol­ecule, C13H18N2O3, contains a benzene ring fused to an oxazine ring and one tert-but­oxy­carbonyl group bound to the N atom of the oxazine ring. A weak intra­molecular C—H⋯O inter­action occurs. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds stack the mol­ecules down the b axis. Weak C—H⋯N contacts connect the stacks, generating a three-dimensional network.

The title mol­ecule, C15H20N2O4, contains a benzene ring fused to an oxazine ring and one tert-but­oxy­carbonyl group bound to the N atom. An intra­molecular C—H⋯O inter­action occurs. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O and C—H⋯O hydrogen bonds.