2D NMR Assignments of an ent-Pimarane Diterpenoid from Euphorbia yinshanica

One known ent-pimarane type diterpenoid,3α,19-dihydroxyl-ent-pimara-9(11),15-diene,has been isolated from the roots of Euphorbia yinshanica for the first time.Its structure has been confirmed by 2D spectral methods(1H-1H COSY,HMBC,HMQC,ROESY),and its NMR signals have been first completely assigned.