COc1ccc(-c2c(-c3cc(OC)cc(OC)c3)n(C)c3ccc(-c4cccc5[nH]ccc45)cc23)cc1
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?