COC(=O)C1(Cc2ccc(O)c(CC3OC3(C)C)c2)OC(=O)C(O)=C1c1ccc(O)cc1
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?