Cc1ccc(OCC2OC(n3cnc4c(Cl)nc(Cl)nc43)CC2Oc2ccc(C)cc2)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?