COCc1cc(CN(C)C(=O)C2CCC(=O)N(Cc3cccc(OC)c3)C2)n[nH]1
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?