We consider the mixed three-qubit bound entangled state defined as the normalized projector on the subspacethat is complementary to an unextendible product basis [C. H. Bennett et aL, Phys. Rev. Lett. 82, 5385 (1999)].Using the fact that no product state lies in the support of that state, we compute its entanglement by providinga basis of its subspace formed by "minimally entangled" states. The approach is in principle applicable to anyentanglement measure; here we provide explicit values for both the geometric.measure of entanglement and ageneralized concurrence.
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