COc1c(OC(C)=O)c(OC(C)=O)cc2c1-c1ccc(SC)c(=O)cc1C(NC(C)=O)CC2
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?