  We study compact hidden charm pentaquarks in the Born-Oppenheimer
approximation, previously introduced for tetraquarks, assuming the heavy pair
to be in a color octet. We show that Fermi statistics applied to the complex of
the three light quarks, also in color octet, requires S-wave pentaquark ground
states to consist of three octets of flavour-SU(3)_f, two with spin 1/2 and one
with spin 3/2, in line with the observed, strangeness S=0,-1, spectrum.
Additional lines corresponding to decays into J/\psi + Sigma and J/\psi + Xi
are predicted. In the language of non-relativistic SU(6), ground state
pentaquarks form either a 56 or a 20 representation, distinguished by presence
or absence of pentaquarks decaying in the spin 3/2 decuplet, e.g. in J/\psi +
Delta^++. Observation of a strangeness S=-2 or isospin I=3/2 pentaquarks would
be a clear signature of compact, QCD bound pentaquarks.
