Internal Standard for AB SIM Back Catalog number: 94541 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended D453000-500MG rac 3,4-Dihydroxymandelic Acid, 500mg Price on request 30004 EPA Method 500 Series Internal Standard #5 Price on request 13124.21-10MG (±)-Cannabichromene, 10mg Price on request