O=C1/C(=C/c2ccccc2S)N=C(c2ccccc2)N1c1ccc2c(c1)Sc1cc(N3C(=O)/C(=C/c4ccccc4S)N=C3c3ccccc3)ccc1N2
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?