O=C(/C=C\c1ccccc1)Oc1ccc(/C=C2\CCC/C(=C\c3ccc(OC(=O)/C=C\c4ccccc4)cc3)C2=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?