COc1ccc(CN2CCC(N3CC(C)OC(C)C3)CC2)c(OC)c1OC.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?