CSC[C@H](NC(=O)COc1cc2c(c3oc(=O)c(C)c(C)c13)CCC(C)(C)O2)C(=O)O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?