For every classical r-matrix $r$, there is a Poisson bracket called Sklyanin bracket associated to $r$. It is defined in (3.3) of page 5 in (http://arxiv.org/pdf/1101.0015v2.pdf) as follows.
\begin{align}
\{f, g\} = \sum_{ij} r_{ij}( \partial_i^L f \partial_j^L g - \partial_i^R f \partial_j^R g ).
\end{align}
My question is: how to compute $\{f, g\}$ explicitly?

For example, in the case that $G = SL(2, \mathbb{C})$, $\mathfrak{g}=\mathfrak{sl}_2$. We choose a basis of $\mathfrak{sl}_2$ to be $e, f, h$. We choose the natural coordinate of $G = SL(2, \mathbb{C})$: $x_{11}, x_{12}, x_{21}, x_{22}$. How do we compute $\partial_i^R x_{kl}$ and $\partial_i^L x_{kl}$?
 
Any help will be greatly appreciated!