Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677184 3,3'-Dichlorobenzidine, 100mg Price on request 59958 Formate (CHOO-) Price on request 3607.7-1ML 4-Heptanol, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 589-55-9 Price on request