CC(C)C(=O)OCC1OC(n2c(Br)nc3c(=O)[nH]c(N)nc32)C(OC(=O)C(C)C)C1OC(=O)C(C)C
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?