CC(=O)O.Nc1nc(N)c2nc(CNc3ccc(C(=O)NC(CCNC(=O)c4ccccc4C(=O)O)C(=O)O)cc3)cnc2n1
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?