AptoChem specializes in the custom synthesis of stable labeled (D, 13C,15N) and radiolabeled (14C) reference standards, test articles, pharmaceuticals and their metabolites. Our scientists possess years of experience and have synthesized challenging isotopically labeled finechemicals for the pharmaceutical industry. The chemists at AptoChem have extensive experience in designing synthetic pathways for these molecules that are efficient and economical. They are well versed in modern compound synthesis and troubleshooting of synthetic pathways.