QC Standard 4 Back Catalog number: 53087 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0275.24-10MG Dibenzo[j,l]fluoranthene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 203-18-9 Price on request 11902.19-K-ME Protriptyline hydrochloride ,1000 µg base/mL,MeOH,1mL, Price on request 673951 Parathion-methyl, 100mg Price on request