CCn1c(SC)nc(=O)c(C(c2ccc(OC)c(O)c2)c2c(O)n(CC)c(SC)nc2=O)c1O
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?