Example CFG

$$\begin{array}{r}S\to ABC\\ A\to ϵ\\ A\to 11A\\ B\to 0\\ B\to 0B0\\ C\to C10\\ C\to C01\\ C\to 1\end{array}$$

We can find that $S$ yields:

$$S{\to }^{\ast }1100010110$$