CLP Acid & Base/Neutral Surrogate Mix Back Catalog number: 21056 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9289.15-100-MEX5 O-Desmethyl tramadol-d6 (racemic) , 100µg base/mL, Solvent-methanol, Unit 1mL, # of units-5, Cas.no. 16412-54-7 Price on request 92262 PCB Congeners Price on request 1892.12-100-AN Endrin, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 72-20-8 Price on request