C[C@]12CCC3C(CC=C4C[C@@H](O)CC[C@@]43C)C1C[C@@H](Br)C2=O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?