The chemical constituents from the heartwood of eucalyptus citriodora

Nineteen compounds were isolated from the CHCl₃ soluble portion of the heartwood of Eucalyptus citriodora. These compounds included trans-calamenene (1), T-muurolol (2), α-cadinol (3), 2β-hydroxy-α-cadinol (4), 4-hydroxy-3,5-dimethoxybenzaldehyde (5), 4-hydroxy-3,5-dimethoxybenzoic acid (6), linoleic acid (7), squalene (8), α-tocopherol (9), erythrodiol (10), morolic acid (11), betulonic acid (12), cycloeucalenol (13), cycloeucalenol vernolitate (14), β-sitosterol (15), β-sitosteryl-β-D-glucopyranoside (16), β-sitostenone (17), yangambin (18), sesamin (19). Among them, 14 is a new compound. The structures of these compounds were elucidated on the basis of spectroscopic evidence.