Lotts, Tobias, et al. “Isatis Tinctoria L.-Derived Petroleum Ether Extract Mediates Anti-Inflammatory Effects via Inhibition of Interleukin-6, Interleukin-33 and Mast Cell Degranulation”. Acta Dermato-Venereologica, vol. 100, no. 10, May 2020, pp. 1-9, doi:10.2340/00015555-3476.