CCC(C)n1cnc2c(c1=O)c1nc3ccccc3nc1n2-c1ccc2c(c1)OCCO2
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?