(3aR,6aR)-1-Phenyl-5-[(R)-1-phenyl­ethyl]-3-[4-(trifluoro­meth­yl)phen­yl]-1,6a-dihydro­pyrrolo[3,4-c]pyrazole-4,6(3aH,5H)-dione

In the title mol­ecule, C26H20F3N3O2, the two central five-membered rings form a dihedral angle of 62.94 (8)°. The absolute configuration was determined by analysis of Bijvoet pairs based on resonant scattering of light atoms, yielding a Hooft parameter y = −0.05 (11). Notable intra- and inter­molecular contacts include C—H⋯O and C—H⋯π(arene) hydrogen bonds

A cycloaddition product of a chiral maleimide: 4-{(3aS*,6aS*)-4,6-dioxo-1-phenyl-5-[(1R)-1-phenyl­ethyl]-1,3a,4,5,6,6a-hexa­hydro­pyrrolo[3,4-c]pyrazol-3-yl}phenyl acetate

In the title mol­ecule, C27H23N3O4, the two central five-membered rings form a dihedral angle of 63.66 (4)°. The absolute configuration was determined by analysis of Bijvoet pairs based on resonant scattering of light atoms, yielding a Hooft parameter y = −0.10 (7)

11β,13-Dihydro­lactucin-8-O-acetate hemihydrate

The title structure (systematic name: 9-hydroxy­methyl-3,6-di­methyl-3-methyl­ene-2,7-dioxo-3,3a,4,5,9a,9b-hexa­hydro­azu­leno[4,5-b]furan-4-yl acetate hemihydrate), C17H20O6·0.5H2O, from Lactuca floridana, has two independent sesquiterpene lactone mol­ecules in the asymmetric unit. Both have their seven-membered rings in the chair conformation. In the crystal, the OH groups and the water mol­ecule form classical O—H⋯O hydrogen bonds with O⋯O distances in the range 2.6750 (17)–2.8160 (18) Å

4-(8-Eth­oxy-2,3-dihydro-1H-cyclo­penta­[c]quinolin-4-yl)butane-1-peroxol

In the title mol­ecule, C18H23NO3, the hydro­per­oxy­butyl substituent is nearly fully extended, with the four torsion angles in the range 170.23 (10)–178.71 (9)°. The O—O distance in the hydro­peroxide group is 1.4690 (13) Å. This group acts as an inter­molecular hydrogen-bond donor to a quinoline N atom. This results in dimeric units about the respective inversion centers, with graph-set notation R 2 2(18)