CCCCN1CC(COCc2ccccc2)Oc2cccc(OCCN3C(=O)[C@H]4[C@H]5C=CC(C5)[C@H]4C3=O)c2S1(=O)=O
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?