Method 1640Mix A Back Catalog number: 52146 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66149 2,2',3,4',5',6-Hexachlorobiphenyl (149) Price on request 681040 MCPA-2-ethylhexyl ester, 100mg Price on request H945928 7-Hydroxy Methotrexate-d3 Ammonium Salt, 1mg Price on request