organic compounds
Open access
The title compound, C16H24O3, was synthesized from ilicic acid which was isolated from the aerial part of Inula Viscosa (L) Aiton [or Dittrichia Viscosa (L) Greuter]. The molecule contains two fused six-membered rings both in chair conformations. In the crystal, molecules are linked into chains running parallel to the a axis by O—HO hydrogen bonds.
organic compounds
Open access
The title compound, C19H29NO6, was synthesized from 9α-hydroxyparthenolide (9α-hydroxy-4,8-dimethyl-12-methylene-3,14-dioxatricyclo[9.3.0.02,4]tetradec-7-en-13-one), which was isolated from the chloroform extract of the aerial parts of Anvillea radiata. The molecule contains a fused five- and ten-membered ring system. The ten-membered ring adopts an approximate chair–chair conformation, while the five-membered ring is in an envelope conformation, with the C atom closest to the hydroxy group forming the flap. In the crystal, weak C—HO hydrogen bonds connect the molecules into layers parallel to (001). An intramolecular O—HN hydrogen bond is also present.