Internal Standard ASTM D-5307 Back Catalog number: 51124 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675708 4-Nonylphenol-di-ethoxylate, 10.0 µg/ml, Acetone, Price on request 680666 Moxifloxacin hydrochloride, 50mg Price on request 676328 Metoprolol tartrate, 250mg Price on request