Synthesis of a deuterated 6‐AmHap internal standard for the determination of hapten density in a heroin vaccine drug product. - Makarova, Mariia; Barrientos, Rodell C.; Torres, Oscar B.; Matyas, Gary R.; Jacobson, Arthur E.; Sulima, Agnieszka; Rice, Kenner C. (Journal of Labelled Compounds & Radiopharmaceuticals, 2020)