CCOC(=O)Cn1c(=O)oc2cc(S(=O)(=O)NCCc3ccc(C)cc3)ccc21
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?