A substituted galacturonan was extracted from edible starfruit (Averrhoa carambola).
It has a (1→4)-α-class="smallcaps">d-Galp A main chain branched at O-2.
(1→5)-α-L-Araf and terminal α-L-Araf and α-class="smallcaps">d-Galp A units were found as side chains.
It demonstrated antinociceptive and anti-inflammatory properties on formalin test.