(A) ATP cavity site of GSK3β (Protein Data Bank ID (PDB) 3PUP) with meridianin F (yellow), the co-crystallized OS1 inhibitor (green), and the best pose of kororamide A (magenta). (B) ATP cavity site of CK1δ (Protein Data Bank ID (PDB) 4KBK) with meridianin F (yellow), the co-crystallized 1QG inhibitor (green), and the best pose of convolutamine J (magenta). (C) ATP cavity site of DYRK1A (Protein Data Bank ID (PDB) 4AZE) with meridianin F (yellow), the co-crystallized 3RA inhibitor (green), and the best pose of kororamide A (magenta). (D) ATP cavity site of CLK1 (Protein Data Bank ID (PDB) 2VAG) with meridianin F (yellow), the co-crystallized V25 inhibitor (green), and the best pose of kororamide A (magenta). Letters and numbers correspond to their position in the amino acid sequence and the PDB file numbering.