SEARCH Articles Figures Tables Alkenes diamination, cyclic ureas Bis cyclic ureas Cyclic Urea-Based Heterocalixarenes Cyclic urea diol Cyclic urea, HIV protease inhibitor Nanotubes from Hydrogen Bonded Cyclic Ureas Polymerization of Cyclic Depsipeptides, Ureas and Urethanes Solvent cyclic ureas Synthesis cyclic ureas Urea derivatives, cyclic With cyclic ureas