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The breakdown of E_6 within the supersymmetric (SUSY) Grand Unified Theories(GUTs) can result in SUSY extensions of the standard model (SM) based on the SMgauge group together with extra U(1) gauge symmetry under which right-handedneutrinos have zero charge. In these U(1)_N extensions of the minimalsupersymmetric standard model (MSSM) a single discrete \tilde{Z}^H_2 symmetrymay be used to suppress the most dangerous operators, that give rise to protondecay as well as non-diagonal flavour transitions at low energies. The SUSYmodels under consideration involves Z' and extra exotic matter beyond the MSSM.We discuss leptogenesis within this SUSY model and argue that the extra exoticstates may lead to the non--standard Higgs decays.

E6 inspired SUSY models with Custodial Symmetry