Cc1cccc(C2c3[nH]c4ccccc4c3CCN2C(=O)c2cc(C(C)C)nc(N)n2)n1
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?