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QCD instantons are known to produce deeply bound diquarks. We study whetherit may be used as building blocks in the formation of multiquark states, inparticular pentaquarks and dibaryons.  A simple model is presented in which the lowest scalar diquark (and possiblythe tensor one) can be treated as an independent ``body'', with the same colorand (approximately) the same mass as a constituent (anti)quark. In it a newsymmetry exists between states with the same number of ``bodies'' but differentnumber of quarks appear, in particular the 3-``body'' pentaquarks can benaturally related to some excited baryons. The limitations of this model areseen from the fact that it leads to light dibaryon $H$. Another reported workis based on a calculation of a large set of correlation functions for nonlocaloperators with 4 to 6 light quarks in the Random Instanton Liquid Model (RILM).  The effective interaction between diquarks is studied and found to posses astrongly {\em repulsive core}, due to the Pauli principle for quark zero modes.Comment: A talk at Hadronic Physics Group meeting at Fermilab, Nov.200

Toward dynamical understanding of the diquarks, pentaquarks and dibaryons