(R)-alpha-((3-Ethoxy-1-methyl-3-oxo-1-propenyl)amino)-4-hydroxybenzeneacetic acid, monopotassium salt 57938-86-0 Benzeneacetic acid, alpha-((3-ethoxy-1-methyl-3-oxo-1-propenyl)amino)-4-hydroxy-, monopotassium salt, (alphaR)- D-(-)-p-Hydroxyphenylglycine, potassium salt, Schiff base with ethyl acetoacetate EINECS 261-027-3 Potassium (R)-((3-ethoxy-1-methyl-3-oxoprop-1-enyl)amino)(4-hydroxyphenyl)acetate