O=C(CCCn1c(=O)c2sccc2n(Cc2cc(=O)n3ccccc3n2)c1=O)NCc1ccco1
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?