Karabacak, Cigdem, Tahir Tilki, and Mustafa Cengiz. 2010. “Two Diterpenoids From Scutellaria Orientalis L. Subsp. Porphyrostegia Edmondson”. Asian Journal of Chemistry 21 (3):2253-58. https://asianpubs.org/index.php/ajchem/article/view/18724.