CCOC(=O)c1c(N2CCCC2)[nH]c(=O)c(C(c2ccco2)c2c(O)c(C(=O)OCC)c(N3CCCC3)[nH]c2=O)c1O
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?