CCOC(=O)c1sc(N2C(=O)C(O)=C(C(=O)c3ccc(C)o3)C2c2cccc([N+](=O)[O-])c2)nc1C
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?