COc1cc(C#Cc2c(-c3cncn3C)n(C)c3ccc(-c4ccc(OC)c(OC)c4)cc23)cc(OC)c1
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?