CCCN(CCC)C(=O)Cn1c(=O)n(-c2cccc(C)c2)c(=O)c2c1c1cc(OC)ccc1n2C
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?