CCc1cc2c(=O)c(-c3nc4ccccc4n3C)c(C)oc2c(CN2CCOCC2)c1O
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?