Cc1ccc(C)c(Oc2coc3cc(OCC(=O)Nc4ccccc4C(C)C)ccc3c2=O)c1
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?