CC(=O)O.COc1cc(C)cc2c(-c3c(O)cc(O)c4c3C[C@H](C)N[C@@H]4C)cc(-c3cc(-c4c(O)cc(O)c5c4C[C@H](C)N[C@@H]5C)c4cc(C)cc(OC)c4c3O)c(O)c12
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?