A new triterpene 3-epiocotillol II was isolated along with sinapic acid, apige hydroxyhopanone, ocotillol II, and betulafolientriol oxide I from pollen grains of silver birch (Betula platyphylla SUKATCHEV var. japonica HARA) and the structure was clarified from chemical and spectral data. Presence of formic acid and other organic acids in the pollen grains were confirmed and analyzed quantitatively.
