Three dimensional Conformal Field Theories from Sasakian seven-manifolds

We present the construction of the candidate conformal field theories dual to $Ad{S}_4$ non-maximally supersymmetric compactifications of 11D supergravity. We compare the spectra of the two theories and discuss the realization of the baryonic symmetries. Finally we comment on the presence in the spectrum of long multiplets with rational energies, trying to explain their existence.