COc1ccc(Cc2nc3c4c(ncn3n2)Oc2c(ccc3ccccc23)C4c2ccc(OC)c(OC)c2)cc1
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?