Synthetic studies of sesquiterpenes with cis-fused decalin system, 4. Synthesis of (+)-5βH-eudesma-3,11-diene, (-)-5βH-eudesmane-4β,11-diol, and (+)-5βH-eudesmane-4α,11-diol, and structure revision of a natural eudesmane-4,11-diol isolated from Pluchea arguta - Ando,M.; Arai,K.; Kikuchi,K.; Isogai,K. (J Nat Prod, 1994)