6-Ethyl-N-methyl-3-nitro-4-nitro­methyl-4H-chromen-2-amine

In the title compound, C₁₃H₁₅N₃O₅, the O and N atoms of the nitro­methyl group and the methyl C atom of the ethyl group are disordered over two sets of sites with refined occupancies of 0.629 (7):0.371 (7) and 0.533 (8):0.467 (8), respectively. The dihydro­pyran ring has an extremely flattened conformation. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, pairs of N—H...O hydrogen bonds link mol­ecules, forming inversion dimers. In addition, weak inter­molecular C—H...O hydrogen bonds are also present.

N-(4-Chloro­phen­yl)-1-(5-{[(2-phenyl­ethen­yl)sulfon­yl]meth­yl}-1,3,4-oxadiazol-2-yl)methane­sulfonamide

In the title compound, C₁₈H₁₆ClN₃O₅S₂, the dihedral angles between the oxadiazole ring and the phenyl and chloro­benzene rings are 23.4 (2) and 45.4 (2)°, respectively. The C—S—N—C and C_ox—C—S—C (ox = oxadiazole) torsion angles are 89.3 (5) and −69.1 (3)°, respectively. A short intra­molecular C—H...O contact closes an S(6) ring. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, generating C(10) chains propagating in [001]. The packing is consolidated by C—H...O, C—H...π and very weak aromatic π–π stacking inter­actions [centroid–centroid separation = 4.085 (2) Å].