COc1ccc(-c2c(C)nn3c(N4CCC(C(=O)NCCN(C)C)CC4)cc(C)nc23)cc1OC
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?