Cc1ccc(C)c(N2C(=O)c3ccc(C(=O)OCC(=O)c4c(N)n(C)c(=O)n(C)c4=O)cc3C2=O)c1
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?