Internal Standard Back Catalog number: 90396 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended XA20950009AL PAH-Mix 9, 100 ng/µl, 1ml Price on request 71241 9,10-Diphenylanthracene Price on request 0442.7-1G Cycloheptane, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 291-64-5 Price on request