COc1cc(C2SCC(=O)N2c2ccc(-n3c(-c4ccccc4)nc4ccccc4c3=O)cc2)ccc1O
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?