CCc1nnc(NS(=O)(=O)c2ccc(N3C(=O)c4ccc(C(=O)O)cc4C3=O)cc2)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?