Construct S8 with the 62350 Indigo Teacher's set to illustrate the D4d symmetry point group.
You can also build the H2O2 C2 point proup chemical structure with the 62053 university organic stereochemistry molecular model set & the 62009 college molecular model kit for organic chemistry. You will need extra sulfur atoms to build the S8 molecule used to represent the D4d point group.