Four new triterpenoid saponins, designated as stelmatotriterpenosides E-H (1-4), together with three known compounds, asterbatanoside B (5), 2alpha,3beta,19alpha,23-tetrahydroxy-olean-12-en-28-oic acid-3-O-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyl ester (6) and 2alpha,3beta,19alpha,23-tetrahydroxy-urs-12-en-28-oic acid-3-O-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyl ester (7), were ...

In the title compound, C22H15Cl2FO2, a chalcone derivative featuring a threefold-halogenated aromatic substituent, the conformation about the C=C bond is E. In the crystal C-H⋯F and C-H⋯Cl contacts connect the mol-ecules into undulating sheets parallel to (101). In addition, C-H⋯π inter-actions are also present.

In the crystal structure of the title compound, C(20)H(16)O(4), which is in the enol form, the central benzene ring makes dihedral angles of 63.42 (9) and 5.19 (10)° with the phenyl and furan rings, respectively. There is a short strong intra-molecular O-H⋯O hydrogen bond.

In the title compound, C(19)H(22)Cl(2)O(3), the cyclo-hexane ring adopts a chair conformation. The furan ring plane forms dihedral angles of 81.88 (2) and 50.19 (3)°, respectively, with the benzene ring and the plane formed by the butyl C atoms. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.

The title compound, C(17)H(15)BrO(2), adopts an E configuration. The dihedral angle between the two benzene rings is 10.09 (11)°. The enone plane makes dihedral angles of 12.05 (11) and 9.87 (11)°, respectively, with the bromo-phenyl and ethoxy-phenyl rings. The eth-oxy group is nearly coplanar with the attached benzene ring. In the crystal structure, the mol-ecules are linked by C-H⋯O hydrogen...

In the title compound, C(21)H(24)O(3), the enone unit is in the s-cis configuration. The dihedral angle between the benzene rings is 2.18 (4)°. In the crystal, mol-ecules are linked by pairs of O-H⋯O inter-molecular hydrogen bonds, forming inversion dimers. The crystal structure is also consolidated by C-H⋯π inter-actions.

The mean planes of the benzene and pyridine rings in the title compound, C(15)H(12)BrNO(2), are nearly coplanar, subtending an angle of 2.8 (8)°. The prop-2-en-1-one group is also in the plane of these rings with an N-C-C-O torsion angle of 179.6 (3)°. A weak C-H⋯Br inter-molecular inter-action contributes to the crystal packing, creating a chain-like structure along the a axis.

In the title mol-ecule, C(16)H(20)O(5), the two 4-hy-droxy-pent-3-en-2-one units are essentially planar, with r.m.s. deviations of 0.0183 (2) and 0.0134 (2) Å for the non-H atoms, and make dihedral angles of 81.20 (10) and 84.44 (10)° with the central furan ring. The dihedral angle between these two side units is 22.06 (9)°. Two intra-molecular O-H⋯O hydrogen bonds generate two S(6) ring motifs...

In the title compound, C(17)H(20)O(3), the five-membered cyclo-pentyl ring displays an envelope conformation, with the atom at the flap position 0.538 (3) Å out of the mean plane formed by the other four atoms. The dihedral angle between the benzene and furan rings is 63.34 (15)°. In the crystal structure, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming a zigzag chai...