COC1=C[C@H]2[C@H]3Cc4ccc(OC)c(O)c4[C@@]2(CCN3C)CC1=O
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?