c1c2c(cc(-n3nnc4c3CCCCCC4)c1-n1nnc3c1CCCCCC3)CCCCCC2
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?