COc1ccc(OC)c(NC(=O)c2cc(C3CC3)nc3c2c(C)nn3-c2ccc(C)cc2)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?