COCCn1c(N)c(NCc2ccccc2)c(=O)n(CC(=O)Nc2cc(C)ccc2C)c1=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?