Interference Standard 4 Back Catalog number: 52041 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3818.18-50-DRIED Senecionine,50 µg/mL,dried down,1mL, Price on request 675689 Proquinazid, 50mg Price on request 8999.21-100-ME 17-Hydroxyprogesterone, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 68-96-2 Price on request