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We explore the consequences of heavy flavour, heavy quark spin and heavyantiquark-diquark symmetries for hadronic molecules within an effective fieldtheory framework.. Owing to heavy antiquark-diquark symmetry, the doubly heavybaryons have approximately the same light-quark structure as the heavyantimesons. As a consequence, the existence of a heavy meson-antimeson moleculeimplies the possibility of a partner composed of a heavy meson and adoubly-heavy baryon. In this regard, the D\bar D* molecular nature of theX(3872) will hint at the existence of several baryonic partners with isospinI=0 and J^P = 5/2^- or 3/2^-. Moreover, if the Zb(10650) turns out to be aB*\bar B* bound state, we can be confident of the existence of \Xibb* \bar B*hadronic molecules with quantum numbers I(J^P) = 1(1/2^-) and I(J^P) =1(3/2^-). These states are of special interest since they can be considered tobe triply-heavy pentaquarks.

Heavy Antiquark--Diquark Symmetry and Heavy Hadron Molecules: Are There Triply Heavy Pentaquarks?