Caffeine, 100 µg/ml, Methanol, 1ml Back Catalog number: 677301 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended M4M172 2,2',3,3',4,5,5'-Heptachloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene Price on request 4PM101 2,2',4,5,5'-Pentachloro-4'-methoxybiphenyl, 1.2ml x 50ug/ml, nonane Price on request 6MBDE47 2,2',4,4'-Tetrabromo-6-methoxydiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request