Group I Elements Starter Kit Back Catalog number: 52253 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 96607 Methcathinone Price on request 93004 1,2,4,5-Tetrachlorobenzene Price on request DF-LCS-B200 Mass-Labelled PCDD/PCDF Solution/Mixture, 1.2ml , nonane Price on request