Interference Standard 4 Back Catalog number: 52041 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71564 Phenol-PFB derivative Price on request 10561.19-50-T 9-Methylbenz[a]anthracene Price on request B-250S Dow FR-250, 100µg/ml in Isooctane, 1ml Price on request