CC(=O)NC1=NC(=O)/C(=C/c2cc(C)n(-c3ccc(NC(C)=O)cc3)c2C)S1
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?