CCOC(=O)c1sc(NC(=O)CSc2nnc(-c3ccc(OC)cc3)n2CCOC)nc1C
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?