  We derive the full analytic expression for the QCD eikonal coupling of a
quark-antiquark state to the exchanged gluon-gluon state in the BFKL formalism.
The formula is valid for all conformal spin configurations of the
quark-antiquark and gluon-gluon states. In particular, a new selection rule on
conformal spins characterizes the non-dominant BFKL components with intercept
below the Pomeron in the conformal-invariant framework.
