Internal Standard Back Catalog number: 96651 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79109 4-Bromophenyl phenyl ether Price on request 680566 Heptachlor-exo-epoxide, 10 µg/ml, Acetonitrile, Price on request D291368 Desmethyl Cariprazine, 1mg Price on request