O=C(CC1=Nc2nnc(CCCCCCCc3nnc4n3C(=O)C(CC(=O)c3ccccc3)=N4)n2C1=O)c1ccccc1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?