COc1ccc(C2CC(=O)N(Cc3ccccc3C)c3c2c(C)nn3-c2nc(C)cc(C)n2)c(OC)c1
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?