COCCNC(=O)COC(=O)/C=C/c1c(C)nn(Cc2ccc(Cl)cc2Cl)c1Cl
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?