CCCOc1ccc(C2c3c(oc4ccccc4c3=O)C(=O)N2c2ccc(C)cn2)cc1OCC
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?