There are several examples this tree growing next to the Belalong Canopy Walkway. It has been provisionally identified as Alantospermum borneense IRVINGACEAE. The family ID is based on recent DNA studies.
Previously Allantospermum borneense has been classified as SIMAROUBIACEAE (Tree Flora of Sabah and Sarawak Vol.01 1996. Pg.427) and in the IXONANTHACEAE (LaFrankie 2010. Trees of Tropical Asia. Pg. 296)
From Flora Malesiana, Vol. 6 (6) pg. 971. Fig. 16.