Internal Standard Back Catalog number: 93185 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2888.30-50-IO 17 alpha(H),21 alpha(H)-Hopane, 50µg/mL in Isooctane, 1ml Price on request 673341 Lufenuron, 100 µg/ml, Acetonitrile, 5ml Price on request 9754.17-100-IO n-Butyl n-pentyl phthalate, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 3461-29-8 Price on request