Effects of sesquiterpenes and amino acid-sesquiterpene conjugates from the roots of Saussurea lappa on inducible nitric oxide synthase and heat shock protein in lipopolysaccharide-activated macrophages - Matsuda,H.; Toguchida,I.; Ninomiya,K.; Kageura,T.; Morikawa,T.; Yoshikawa,M. (Bioorg Med Chem, 2003)