CC(=O)O.Cc1cc(NCCCCCCNc2cc(C)nc3ccc(N)cc23)c2cc(N)ccc2n1
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?