Collect. Czech. Chem. Commun.
1974, 39, 480-500
https://doi.org/10.1135/cccc19740480
Standard sesquiterpenic lactones for structural correlations; Stereoisomeric (6R,7S,10S,11S)-10-hydroxyguaian-6,12-olides and related (6R,7S)-guaienolides
K. Vokáč and Z. Samek