O=C1OC[C@@H]2Cc3cc4c(cc3[C@H](c3ccc5c(c3)OCO5)[C@@H]12)OCO4
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?