Scientists Solve a 30-year Rye Pollen Mystery That Could Transform Cancer Research

Scientists at Northwestern University have solved a nearly 30-year-old mystery surrounding two unusual molecules found in rye pollen. The molecules, known as secalosides A and B, are a pair of glycosides isolated from rye pollen that exhibit in vivo anticancer activity against various cancer cell lines. Nearly three decades ago, researchers observed that the compounds could slow tumor growth in animal models of cancer, but progress stalled because their exact structures were unknown. Chemists constructed the molecules from scratch in the laboratory and confirmed their precise three-dimensional structures for the first time. The research appears in the Journal of the American Chemical Society under the title Synthesis and structural confirmation of secalosides A and B. The structural assignment and synthetic route provide a foundation for exploring the molecular mechanism of action. The finding gives researchers an accurate molecular blueprint and a reliable starting point for investigating how the molecules interact with the immune system and whether they could inspire new approaches to cancer treatment. The work was reported July 6, 2026,