White square prismatic or flaky crystals (ethanol or methanol), odorless, bitter taste. Soluble in boiling ethanol, slightly soluble in methanol or ethanol, very slightly soluble in chloroform, almost insoluble in water or ether.

Melting point 230～231°C, (α)17D -126.6±2° (glacial acetic acid), [α]D -112.7 (c,0.53,MeOH), with alkaline 2% 3,5-dinitrobenzene carboxylic acid reagent, it shows purplish-red color, and the reaction of ferric isohydroxamic acid is positive.

Density (21°C) 1.2317g/cm3. uvλEtOHmax nm (ε),223(12300); IRvKBrmax cm-1: 3448,3390 to ?279(OH),1828,1647,906 (C=CH2),1727 (α,β-unsaturated γ-lactone),1672 ( *** of C=C); 13CNMR.