COc1ccc(/C=C2\Oc3cc(OCC(=O)N4CC(O)C[C@H]4C(=O)O)ccc3C2=O)c(OC)c1OC
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?