COC(=O)Nc1cc(OCCCOC(C)=O)c2[nH]c(C(=O)OC)cc2c1C[C@H](O)CO
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?