Neophathalides A and B, two pairs of unusual phthalide analog enantiomers from Ligusticum chuanxiong

Two pairs of unusual phthalide analog enantiomers, (+)- and (−)-neophathalides A and B [(+)- and (−)-1 and 2], were isolated from the rhizome of Ligusticum chuanxiong Hort.