(3R,4S,5R)-5-[(1S)-1-Carboxy-1-phosphonoethoxy]-4-hydroxy-3-(phosphonooxy)-1-cyclohexene-1-carboxylic Acid is a research reagent used to study differential inhibition of class I and class II 5-enolpyruvylshikimate-3-phosphate synthases by tetrahedral reaction intermediate analogs