C=CCOc1c(Br)cc(C2C3=C(CCCC3=O)N(C)C3=C2C(=O)CCC3)cc1OCC
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?