CCC1(C)Cc2c(sc3c2c(=O)n(C)c2nnc(SCC(=O)c4ccccc4)n32)CO1
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?