TP-064 is a potent and selective PRMT4 inhibitor. TP-064 includes inhibition of PRMT4 with IC50 < 10nM for methylation of H3 (1-25) and greater than 100-fold selectivity over other histone methyltransferases and non-epigenetic targets. TP-064 inhibits the methylation of MED12 with IC50 = 43 nM in cell.