Cc1ccc(O)c(C(c2ccc(C(c3cc(C)ccc3O)c3cc(C)ccc3O)cc2)c2cc(C)ccc2O)c1
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?