COc1ccc(-c2nc(SCCOc3cc(C)ccc3C(C)C)n3[nH]c(=O)cc3n2)cc1
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?