Ethno-medicinal study of Artemisia ordosica Krasch. (traditional Chinese/Mongolian medicine) extracts for the treatment of allergic rhinitis and nasosinusitis.

Ethnopharmacological Relevance: Artemisia ordosica Krasch. (AOK) has been used for rheumatic arthritis, cold headache, sore throat, etc. in traditional Chinese/Mongolian medicine and is used for nasosinusitis by local Mongolian "barefoot" doctors.

(E)-N'-(3,4-Dichloro-benzyl-idene)nicotino-hydrazide monohydrate.

In the title compound, C(13)H(9)Cl(2)N(3)O·H(2)O, the 3,4-dichloro-benzene ring is nearly coplanar with the pyridine ring, making a dihedral angle of 4.78 (8)°. Inter-molecular O-H⋯O, O-H⋯N, N-H⋯O and weak C-H⋯O hydrogen bonding is present in the crystal structure.

N'-(Propan-2-yl-idene)nicotinohydrazide.

Crystals of the title compound, C(9)H(11)N(3)O, were obtained from a condensation reaction of nicotinohydrazide and acetone. In the mol-ecular structure, the pyridine ring is oriented at a dihedral angle of 36.28 (10)° with respect to the amide plane.

(E)-N'-(1,3-Benzodioxol-5-ylmethyl-ene)nicotinohydrazide monohydrate.

In the title compound, C(14)H(11)N(3)O(3)·H(2)O, the planar [maximum deviation 0.135 (1) Å] 1,3-benzodioxole ring system is oriented at a dihedral angle of 13.93 (7)° with respect to the pyridine ring.

N'-(3-Bromo-4-methoxy-benzyl-idene)nicotinohydrazide monohydrate.

In the title compound, C(14)H(12)BrN(3)O(2)·H(2)O, the benzene ring is oriented at a dihedral angle of 39.66 (11)° with respect to the pyridine ring. The solvent water mol-ecule links with the organic compound via O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonding.

2,6-Dichloro-benzaldehyde oxime.

In the title compound, C(7)H(5)Cl(2)NO, there are two mol-ecules in the asymmetric unit. The mol-ecules are essentially identical. Each mol-ecule is connected to a symmetry-related mol-ecule through an inversion center by O-H⋯N hydrogen bonds, building an R(2) (2)(6) graph-set motif.

1-(4-Nitro-phen-yl)-2-(3-phenyl-allyl-idene)hydrazine.

In the title compound, C(15)H(13)N(3)O(2), the nitro-benzene and benzene rings make a dihedral angle of 9.1 (2)°. The crystal structure is consolidated by inter-molecular N-H⋯O hydrogen bonds.

2,4-Dichloro-benzaldehyde 2,4-dinitro-phenyl-hydrazone.

The asymmetric unit of the title compound, C(13)H(8)Cl(2)N(4)O(4), contains two independent but similar and almost planar mol-ecules. An intra-molecular N-H⋯O hydrogen bond is observed in each mol-ecule.

N'-(3-Phenyl-allyl-idene)isonicotino-hydrazide.

The asymmetric unit of the title compound, C(15)H(13)N(3)O, contains two similar mol-ecules. Each mol-ecule is non-planar, as indicated by the dihedral angles between the pyridine and benzene rings of 45.2 (2) and 56.