COc1cc(C2SCC(=O)N2c2ccc(-c3ccc(-n4c(-c5ccccc5)nc5ccccc5c4=O)cc3)cc2)cc(OC)c1OC
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?