Ligustilide is a phthalide derivative and is one of the main compounds of Danggui essential oil and Rhizoma Chuanxiong, a Chinese medicinal herb. Synonyms: 3-butylidene-4,5-dihydro-1(3H)-isobenzofuranone; 3-butylidene-4,5-dihydrophthalide Molecular Formula: C12H14O2 Molecular Weight: …