Abstract:In a previous paper, we reported the isolation and structure elucidation of three eudesmane sesquiterpenoids from Laggra Pterodenta. As a continuation of the studies on the biologically active constituents of this plant, we have got another four new eudesmane sesquiterpenoids from it. By spectral evidences, their structures are elucidated as 5,l2-diene eudesmane 13-oic acid(1); 1β-hydroxy-5,12-diene eudesmane l3-oic acid(2) 3β-hydroxy-5,l2-diene eudesmane 13-oic acid(3) and 2α,3β-dihydroxy-5,12-diene eudesmane 13-oic acid(4). They are named as Pterodontic acid(1);1β-hydroxy Pterodontic acid(2); 3β-hydroxy Pterodontic acid(3) and 2α,3P-dihtdroxy Pterodontic acid(4).