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Neolignans and lignans with diverse new chemical structures, including eleven pairs of separated chiral enantiomers [(+)-/(−)- 1 –(+)-/(−)- 5 , (+)-/(−)- 8 , (+)-/(−)- 10 , and (+)-/(−)- 12 –(+)-/(−)- 15 ], two achiral compounds ( 6  and  9 ), and an unseparated racemate [(±)- 11 ], together with a new natural product ( 7 ) and 21 known derivatives, were isolated from an aqueous extract of the  Angelica sinensis  root head (guitou). Among the chiral isolates, (+)-/(−)- 13  and (+)-/(−)- 15  were scalemic pairs with enantiomeric ratios of around 3:1 and 1.5:1, respectively, while others were enantiomeric equivalent pairs. This indicates that the diverse neolignans in  A. sinensis  are biosynthesized via different pathways with varying degrees of stereo-controlled manners.

Diverse neolignans and lignans from an aqueous extract of the Angelica sinensis root head