13C3-Caffeine, 100 µg/ml, Methanol, 1ml Back Catalog number: 681491 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended 9684.6-K-IO Hexamethylcyclotrisiloxane, 1000µg/mL, Solvent-Isooctane, Unit 1mL, # of units-1, Cas.no. 541-05-9 Price on request 11130.17-50-T 2,2-Bis(chloromethyl)-1,3-propandiol bis[bis(2-chloroethyl) phosphate],50 µg/mL,toluene,1mL, Price on request 19049 EPA Method 507 Surrogate Standard Price on request