COc1ccc(OC)c2sc(N3C(=O)/C(=C/c4cccc(Oc5ccccc5)c4)N=C3c3ccccc3)nc12
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?