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We consider a non-supersymmetric Hanany-Witten type IIB brane configurationthat realises a three dimensional USp(2N) gauge theory with quarks in thetwo-index antisymmetric representation and SO(4) flavour symmetry. Using typeIIB S-duality we find the mirror dual, an SO(2N-1) field theory with scalars inthe antisymmetric representation. Analysing the magnetic dual we study thevacuum structure of the USp(2N) model and propose that the SO(4) globalsymmetry is unbroken. In order to support our proposal we present an SO(4)symmetric BIon configuration that describes anti-D3 branes polarising intofivebranes in the S-dual Hanany-Witten setup. We also comment on dynamicalflavour symmetry breaking in other QCD3 theories with quarks in two-indexrepresentations.

QCD3 with Two-Index Quarks, Mirror Symmetry and Fivebrane anti-BIons near Orientifolds