Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676709 (-)-Cotinine, 25mg Price on request 59754 pH 8.0 Standard @ 25°C Price on request 677134 5-Hydroxyflunixin, 10mg Price on request