Heraclenin, a natural furanocoumarin, isolated from the root parts of the plant Prangos pabularia. Heraclenin significantly inhibits T cell receptor-mediated proliferation in human primary T cells in a concentration-dependent manner by targeting nuclear factor of activated T-cells (NFAT)[1]. NFAT[1]
[1]. MÁrquez N, et al. Imperatorin inhibits T-cell proliferation by targeting the transcription factor NFAT. Planta Med. 2004 Nov;70(11):1016-21.