Cc1cccc(N2CCN(C(=O)c3cc4c(=O)n(C)c5ccccc5c4n3C)CC2)c1C
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?