COc1ccc(CCNC(=O)c2ccc3c(=O)n(Cc4ccco4)c(=S)[nH]c3c2)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?