Internal Standard for AB SIM Back Catalog number: 94541 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11902.19-K-ME Protriptyline hydrochloride ,1000 µg base/mL,MeOH,1mL, Price on request 73353 Benfuracarb Price on request 2017.6-20K-ME Fluorobenzene,20000 µg/mL,MeOH,1mL, Price on request