Three new substituted cinnamoyl hydroxycitric acids have been isolated from corn plant (Zea mays L.) and their structures established as 2-O-trans-p-coumaroyl-(2S, 3S)-hydroxy-citric acid (I), 2-O-trans-feruloyl-(2S, 3S)-hydroxycitric acid (II), and 2-O-trans-caffeoyl-(2S, 3S)-hydroxycitric acid (III) on the basis of spectroscopic and chemical evidence.
