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Thank you for your reply. I was using $\mathcal{C}_h(G^*)$ in the sense of the quantization of $\mathcal{C}(G^*)$, but then $\mathcal{C}(G^*)=U_h(\mathfrak{g})$, so my question makes no sense! The example you gave looks very concrete and good. I would like to understand the relation between the Drinfeld double and the Heisenberg double of the Poisson Lie group and the Drinfeld double and the Heisenberg double of the Hopf algebra through concrete examples. I will try to write down these relations with your examples.