COc1ccc(CCN2CC(C(=O)OCC(=O)Nc3c(C)nn(-c4ccccc4)c3C)CC2=O)cc1OC
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?