C5H9NO4

The molecular formula C5H9NO4 (molar mass 147.13 g/mol, exact mass: 147.0532 u) may refer to:


 * O-Acetylserine, an α-amino acid
 * Glutamic acid, a proteinogenic amino acid
 * N-Methyl- D -aspartic acid, a specific agonist at the NMDA receptor
 * L -threo-3-Methylaspartate
 * N-Methyliminodiacetic acid