EPA Method 551 “Mix B” Back Catalog number: 30395 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended SC-212704 rac 3-Hydroxyisobutyric Acid, 1mg Price on request 11217.25-100-IO Trixylyl phosphate, purified ion m/z 424 (heptamethyl),100 µg/mL,isooctane,1mL, Price on request R414608 Ribitol-1,2,3,4,5-13C5, 5mg Price on request