A new 4-oxazolidinone from Sorghum halepense (L.) Pers.

Sorghum halepense (L.) Pers. is known as invasive weed in the world. In this paper we report three rare natural products from this weed. The compounds include a new rare natural product 2,2-dimethyl-5-(4-hydroxyphenyl)-4-oxazolidinone (1), and two other known mandelic acid derivatives, ethyl 4-hydroxymandelate (2) and 4-hydroxymandelamide (3). The structures of these compounds were elucidated by extensive spectroscopic analysis (MS, IR, 1H, 13C NMR and 2D NMR).