CCS(=O)(=O)c1ccc(-c2ccc(-c3n[nH]c4c3Cc3cc(O)c(OC)cc3-4)cc2)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?