O=c1c2ccccc2sc2cccc(NCCCN3CCN(CCCNc4cccc5sc6ccccc6c(=O)c45)CC3)c12
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?