Cc1c(O)c2c(c(C(=O)/C=C/c3ccccc3)c1O)OC(C)(C)C=C2
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?