  The $ND\Lambda_c$ coupling constant is evaluated in a full QCD sum rule
calculation. We study the Borel sum rule for the three point function of one
pseudoscalar one nucleon and one $\Lambda_c$ current up to order seven in the
operator product expansion. The Borel transform is performed with respect to
the nucleon and $\Lambda_c$ momenta, which are taken to be equal, whereas the
momentum $q^2$ of the pseudoscalar vertex is taken to be zero. This coupling
constant is relevant in the meson cloud description of the nucleon which has
been recently used to explain exotic events observed by the H1 and ZEUS
Collaborations at HERA.
