O=c1[nH]c(=S)c2cc3c(=S)[nH]c(=O)n(CCC(c4ccccc4)(c4ccccc4)c4ccccc4)c3nc2n1CCC(c1ccccc1)(c1ccccc1)c1ccccc1
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?