COC(=O)c1ccc(C2c3c(oc4cc(C)c(C)cc4c3=O)C(=O)N2CCCN(C)C)cc1
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?