CCCCCCCCCCCCCCCCNc1ccn(C2CC(O)C(COC(c3ccccc3)(c3ccccc3)c3ccc(OC)cc3)O2)c(=O)n1
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?