Cc1c(CC(=O)O)c(=O)oc2c(C)c3occ(-c4ccc(Br)cc4)c3cc12
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?