In the title compound, C14H12FNO4S, the dihedral angle between the aromatic rings is 50.26 (9)° and the C—S—N—C bond adopts a gauche conformation [torsion angle = −68.12 (15)°]. The dihydro­dioxine ring is disordered over two orientations, which both approximate to half-chairs, in a 0.880 (7):0.120 (7) ratio. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into C(4) chains propagating in [100]. Weak C—H⋯O and C—H⋯F inter­actions consolidate the packing.

In the title mol­ecule, C13H19NO3S, the S atom has a distorted tetra­hedral geometry with an O—S—O bond angle of 120.39 (18)°. The cyclo­hexane ring has a chair conformation. In the crystal, mol­ecules are connected by inter­molecular N—H⋯O hydrogen bonds, forming zigzag hydrogen-bonded chains directed along the c axis.

The title compound, C8H10NO2 +·H2PO4 −, is a derivative of the naturally occurring compound methyl­anthranilate. The asymmetric unit comprises the 2-(methoxy­carbon­yl)anilinium cation and the dihydrogen phosphate anion. In the cation, the dihedral angle between the benzene ring plane and that through the methyl ester substituent is 22.94 (9)°. In the crystal, adjacent cations and anions form dimers through N—H⋯O and O—H⋯O hydrogen bonds, respectively. Additional N—H⋯O and C—H⋯O contacts result in a network of cation and anion dimers stacked down the b axis.

The title compound, C7H6ClNO2, crystallizes with two roughly planar mol­ecules in the asymmetric unit (r.m.s. deviations = 0.073 and 0.074 Å). The amine H atoms of the two mol­ecules have opposite orientations. In the crystal, mol­ecules are linked into dimers by pairs of O—H⋯O hydrogen bonds, generating R 2 2(8) loops. N—H⋯N and N—H⋯Cl hydrogen bonds link the dimers into a three-dimensional network. The crystal studied was found to be a racemic twin.

In the title compound, C10H11NO3S, the benzisothia­zole ring system is almost planar [maximum deviation = 0.030 (1) Å for the S atom]. The isoprop­oxy group is almost in the plane of the benzisothia­zole ring system [N—C—O—C = 4.5 (2)°] with one of its methyl groups in an anti­periplanar orientation relative to the benzisothia­zole ring system [C—C—O—C = −162.0 (2)°].