O=C(O)CN(CC(=O)O)Cc1cc(C#Cc2ccc(C#Cc3ccccc3)cc2)cc(CN(CC(=O)O)CC(=O)O)n1
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?