CCC(C(=O)Nc1cccc(OC)c1)n1nc(C)c2c(C)n(-c3ccccc3)nc2c1=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?