Cc1ccc(NC(=O)CCCn2nc(C)c3c(C)n(-c4ccccc4)nc3c2=O)cc1C
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?