Cc1c(C(C)C[C@H](C)O)oc(=O)c2c1Oc1c(C)c(C(C)C[C@H](C)O)oc(=O)c1C2
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?