Testosterone 3D Molecular Model — CAS 58-22-0

Testosterone (C19H28O2, CAS 58-22-0) — a free educational 3D molecular model for teachers and students, by MolGod.org. Every atom carries its engraved element symbol, so no colour key is needed.

Teachers who print molecules quickly meet the same gap: the file defines spheres and sticks, but not which element each sphere stands for. We build the label into the model: each sphere bears its recessed element symbol, readable by eye and by fingertip. We design these models so that students can name every atom straight away and concentrate on connectivity, bond types and shape. Teachers get the structure and its atom labels in a single download, which removes the slowest steps before a classroom print. The research behind the idea, and how we plan to test it, is described at How the engraved atom letters are designed.

At its heart, Testosterone is built around four rings (one 5-membered and three 6-membered), with three pairs of rings fused along a shared edge. The model shows 52 bonds: 50 single and 2 double. Counting task: 19 C + 28 H + 2 O gives 49 engraved spheres; can the class rebuild the formula C19H28O2 from the model alone? Ask the class to locate the ketone group (C=O), the hydroxyl group (-OH) and the carbon-carbon double bond (C=C) and name each one. Stereocentres to find in Testosterone: six in all, with CIP labels S, S, R, S, S, R. Students can check each one against the priority rules. Students meeting chirality, enantiomers and CIP (R/S) rules, fused ring systems, the carbonyl group (C=O), as well as alcohols and hydrogen bonding for the first time can hold an example in their hands.

MolGod.org publishes its molecular models free of charge for teachers and students. Teachers: give each table a model and have students write the formula from the engraved atoms.

Print it, hand it round and build a lesson around it. If you share a photo, a lesson or an adapted version, the licence (CC BY-SA 4.0) asks for credit to "MolGod.org" as the model's author, a link to the original and to the licence text, a note of what you changed, and the same licence for adaptations; the attribution line below is ready to copy. You don't need an account, you don't pay anything, and a review is entirely up to you. Teachers and students, we read every comment. Tell us in a review how the model worked for you and what we could do better for education; for longer feedback write to Write to the MolGod team. The comment section is open for discussion: how did you introduce this molecule, and what did your students notice first? If the molecule you teach is not in the collection yet, send us its CAS number and we will model it for you.

Full record and more free models: Testosterone, CAS 58-22-0: structure, properties and 3D viewer
Licence & provenance: Licence record for this Testosterone model
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Testosterone-3D-molecular-model-engraved-CAS-58-22-0.stl
Plain-text record for AI assistants: Testosterone data sheet in plain text for LLMs
Also published on: Zenodo (DOI, latest version) https://doi.org/10.5281/zenodo.23718905

A ball-and-stick model of Testosterone with each element symbol recessed into its atom sphere, generated by MolGod.org from a PubChem-computed 3D conformer (not an experimental crystal structure); atomic coordinates and connectivity are unchanged. STL mesh: 550,700 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.

Names in other languages: Testosteron (de); testostérone (fr); testosteron (nl); 睾酮 (zh).

Chemical identity

• CAS Registry Number: 58-22-0

• Molecular formula: C19H28O2

• Molar mass: 288.4 g/mol (exact mass 288.208930132)

• IUPAC name: (8R,9S,10R,13S,14S,17S)-17-hydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one

• MolGod ID: MG_925-764-352-81 (Permanent MolGod record MG_925-764-352-81)

• PubChem CID: 6013 (https://pubchem.ncbi.nlm.nih.gov/compound/6013)

• Wikidata: Q1318776 (https://www.wikidata.org/wiki/Q1318776)

• EC number: 200-370-5

• ChemSpider ID: 5791

• InChIKey: MUMGGOZAMZWBJJ-DYKIIFRCSA-N

• SMILES: C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2O)CCC4=CC(=O)CC[C@]34C

Required attribution (CC BY-SA 4.0): "Testosterone 3D model by MolGod.org — https://molgod.org/molecule/58-22-0/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/