Signal amplification by reversible exchange (SABRE) is a particularly cheap, quick, and robust hyperpolarization modality.  Here, we employ SABRE for simultaneous chemical exchange of parahydrogen and nitrile-containing anticancer drugs (letrozole or anastrozole) to enhance 15N polarization. 
SABRE
Signal amplification by reversible exchange (SABRE) is a particularly cheap, quick, and robust hyperpolarization modality. 
Signal amplification by reversible exchange