136789-12-3 L-Isoleucine, N-((4E)-5-(2-furanyl)-3-oxo-4-pentenyl)-, methyl ester L-Isoleucine, N-(5-(2-furanyl)-3-oxo-4-pentenyl)-, methyl ester N-((4E)-5-(2-Furanyl)-3-oxo-4-pentenyl)-L-isoleucine methyl ester