摘要:
Two new triterpenoids, ursa-12-sene-3,11-diol 3-O-palmitate (1) and ursa-12-sene-1,3,11-triol 3-O-palmitate (2), were isolated from the 70% aqueous acetone extract of the aerial parts of Viburnum betulifolium, together with the artificial diene derivative of 2, ursa-12-dien-1,3-diol 3-O-palmitate (2a). Their structures were characterized by various spectroscopic methods, including 1D NMR, 2D NMR, and HR-ESI-MS.