Interference Standard 1 Back Catalog number: 53039 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92710 Acetophenone & Benzophenone Price on request 13800-0159-1000IO Dimethylisophthalate, 1000µg/ml in Isooctane, 5ml Price on request 682965 5-Aminosalicylic acid, 1000mg Price on request