COc1ccc(CN2CCN(Cc3ccc(OC)c(OC)c3OC)CC2)cc1.O=C(O)C(=O)O
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?