L-(+)-Ampicillin-d5 is deuterium labeled L-(+)-Ampicillin (A634335). L-(+)-Ampicillin is an isomer of Ampicillin (A634300), a β-lactam antibiotic used for treating bacterial infection. Ampicillin interferes with cell wall synthesis in bacteria. Molecular Formula: C16H14D5N3O4S Molecular Weight: 354.44