O=C1c2ccccc2C(=O)c2c(Nc3cc4c5c(ccc6c7ccc8c9c(cc(Nc%10cccc%11c%10C(=O)c%10ccccc%10C%11=O)c(c3c56)c97)-c3ccccc3C8=O)C(=O)c3ccccc3-4)cccc21
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?