Cn1c(=O)n(C)c2cc(CNc3ccc(N4CCOCC4)c(C(=O)O)c3)ccc21
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?