CK1抑制剂;CK1 inhibitor;D4476是可渗透入细胞的CK1δ抑制剂,IC90 <10 uM,最初是作为ALK5抑制剂;D4476, a cell-permeant inhibitor of CK1δ (IC90 <10 uM), originally identified as inhibitors of activin receptor-like kinase ALK5.A cell-permeable triaryl substituted imidazolo compound that acts as a selective inhibitor of casein kinase 1 (CK1).