C[C@@H](C(=O)N1CCN(C(=O)OC(C)(C)C)CC1)n1cc(CCCN=C(NC(=O)OC(C)(C)C)NC(=O)OC(C)(C)C)nn1
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?