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Pyridin-4-ylmethanaminium perchlorate monohydrate (synonym: 4-picolyl­ammonium perchlorate monohydrate), C6H9N2+·ClO4−·H2O, crystallizes in the monoclinic system (space group P21/n) with the asymmetric unit comprising two formula units (Z′ = 2). All mol­ecular entities are located on general positions. The two crystallographically distinct 4-picolyl­ammonium cations exhibit different conformations. The two unique perchlorate anions are non-disordered, showing an r.m.s. deviation of 0.011 Å from mol­ecular Td symmetry. The supra­molecular structure in the solid state features an intricate tri-periodic network of N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds.

(Z)-1,2-Bis[4-oxo-2-(piperidin-1-yl)-6-(tri­fluoro­meth­yl)-4H-benzo[e][1,3]thiazin-8-yl]diazene oxide, C28H24F6N6O3S2, was obtained and its structure determined while attempting to crystallize and structurally characterize 8-nitro-2-(piperidin-1-yl)-6-(trifluoro­meth­yl)-4H-benzo[e][1,3]thia­zin-4-one, a simplified analogue of the antituberculosis clinical drug candidate BTZ043. X-ray crystallography revealed the structure of the az­oxy compound to be comprised of two benzo­thia­zinone moieties linked by a Z-configured az­oxy group in an almost coplanar arrangement. In the crystal, the mol­ecules are densely packed, revealing a herringbone pattern.