CC(=O)c1c(C)oc2ccc(N(C(C)=O)S(=O)(=O)c3cccc4cccnc34)cc12
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?