COc1ccc([C@]23Cc4ccccc4[C@H](O2)c2c(c4ccc(OC)cc4oc2=O)O3)cc1
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?