Advances in studies on structural modifications and biological activities of 18β-glycyrrhetinic acid Structural modification and biological evaluation of monomeric compound from Pandanus tectorius Design and synthesis of fingolimod analogues as well as evaluation on their antitumor activity Research progress on glycosidation modification of genistein Research progress on pharmacological effects of asiatic acid and its structural modification Semisynthesis and structure-activity relationship of O-methylated derivatives of quercetin Preparation and evaluation of oridonin derivatives Structural modification and biological evaluation of monomeric compounds from Aralia elata Advances in studies on structural modifications and biological activities of 18β-glycyrrhetinic acid Research progress on structure-activity relationship of ligustrazine derivatives