Multi-Element Internal Standard / Back Catalog number: 53319 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10884.18-10MG Estrone-16,16-d2,neat,neat,10mg, Price on request 82432 2-Butanone Price on request 673650 Paraoxon-methyl, 100 µg/ml, Ethyl acetate, 5ml Price on request