  We study the full backreaction of anti-D3 branes smeared over the tip of the
deformed conifold. Requiring the 5-form flux and warp factor at the tip to be
that of anti-D3 branes, we find a simple power counting argument showing that
if the three-form fluxes have no IR singularity, they will be necessarily
imaginary-anti-self-dual. Hence the only solution with anti-D3 branes at the
tip of the conifold that is regular in the IR and the UV is the
anti-Klebanov-Strassler solution, and there is no regular solution whose
D3-charge is negative in the IR and positive in the UV.
