Dendocarbin A: a sesquiterpene lactone from Drimys winteri

Natural dendocarbin A is a sesquiterpene lactone isolated from Drimys winteri. X-ray crystal structure analysis confirmed the S/R character of the chiral centres at C-5/C-10 and C-9/C-11, respectively. The α-OH group at C-11 was found to be involved in inter­molecular hydrogen bonding, defining chains along the <100> 2₁ screw axis.

Hobartine: a tetra­cyclic indole alkaloid extracted from Aristotelia chilensis (maqui)

In the crystal structure of the natural compound hobartine, a tetra­cyclic alkaloid isolated from Aristotelia chilensis, the supra­molecular structure in strongly related to the twofold screw axis, around which isolated chains build up, inter­nally linked by an N—H...N hydrogen bond which is the only significant inter­molecular inter­action present in the structure.