Cc1cc2c(nc1C)CCCCN2C[C@H](O)CN1CCCc2nc(-c3ccc(Br)cc3)ccc21
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?