O=c1c(Cc2c(O)ccc3ccccc23)nnc2sc(-c3nn4c(=O)c(Cc5c(O)ccc6ccccc56)nnc4s3)nn12
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?