O=S(=O)(O)c1ccc2c(c1)-c1nc-2nc2[nH]c(nc3nc(nc4[nH]c(n1)c1ccc(S(=O)(=O)O)cc41)-c1ccc(S(=O)(=O)O)cc1-3)c1ccc(S(=O)(=O)O)cc21
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?