CCN1c2ccccc2-c2nc(SCC(=O)Nc3c(C)cc(C)cc3C)ncc2S1(=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?