Nc1ccc(Oc2ccc(C34CC5CC6C3CC3CC4C(C5)C6(c4ccc(Oc5ccc(N)c(O)c5)cc4)C3)cc2)cc1O
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?