CCN(CC)C(=O)CC(c1cc(OC)c(OC)c(OC)c1)c1c(OC)cc(OC)c2c(-c3ccccc3)cc(=O)oc12
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?