CC(=O)O.CNCCNc1ccc2c3c(nn2CCNCCO)-c2c(O)ccc(O)c2C(=O)c13
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?