A novel p -coumaroyl dimethyl malate ( 1 ) was isolated from the Pandanus amaryllifolius leaf in addition to three known analogs of p -coumaroyl dimethyl malate ( 2 – 4 ), and their structures were elucidated by analysis of the spectroscopic data. The p -coumaroyl malate derivatives were isolated as a mixture of E and Z isomers. To determine the cause of isomerization, the p -coumaroyl malate isolated in this study was synthesized. We concluded that the Z isomer might be an artifact generated from the E isomer through purification steps.