O=C(NCC1=C(c2cccc3ccccc23)C[C@@H]2CC[C@H]1N2Cc1ccco1)c1cccnc1
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?