Cc1c(N2C(=O)C(O)=C(C(=O)c3ccc(Br)cc3)C2c2cccnc2)c(=O)n(-c2ccccc2)n1C
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?