COc1ccc(CCNC(=O)CCc2c(C)nc3c(c(C)nn3-c3ccccc3)c2C)c(OC)c1
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?