Cc1c[nH]c2cccc(OCC(CNC(C)(C)C)OC(=O)c3ccccc3)c12.Cl
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?