O[C@@H]1C[C@H]2N3CC[C@@]2(c2cc4c(cc2C3)OCO4)[C@H]2O[C@@H]12
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?