A new brominated polyacetylene, xestonariene I (1), along with three known related analogues (2-4), was obtained from Chinese marine sponge Xestospongia testudinaria. Its structure was determined on the basis of detailed spectroscopic analysis and by comparison with literature data. Compound 4 exhibited significant inhibitory activity against pancreatic lipase, which plays a key role in preventing obesity, with an IC50 value of 0.61 μM, being comparable to that of the positive control orlistat (IC50 = 0.78 μM).
Keywords: Brominated polyacetylene; Xestospongia testudinaria; pancreatic lipase inhibitory activity; sponge.