Description

This entry presents L-menthol (C10H20O; CAS 2216-51-5; PubChem CID 16666 (https://pubchem.ncbi.nlm.nih.gov/compound/16666)) as a 3D-printable ball-and-stick model in which every atom carries its engraved element symbol (C, H, O), so the model can be read without a colour key. Atomic coordinates come from the PubChem-computed 3D conformer (not an experimental crystal structure); coordinates and connectivity are unchanged. Biological relevance: L-menthol has a recorded use as a medication (source: Wikidata Q407418 (https://www.wikidata.org/wiki/Q407418), retrieved 2026-10-10). Structure at a glance 31 atoms: 10 C, 20 H, 1 O 31 bonds, all single One 6-membered ring Functional group: one hydroxyl group (-OH) Three stereocentres with CIP labels R, S, R — IUPAC name (1R,2S,5R)-5-methyl-2-propan-2-ylcyclohexan-1-ol One hydrogen-bond donor and one acceptor (computed) Every carbon atom is sp3-hybridised (tetrahedral) Use in teaching Counting task: students tally the engraved symbols (10 C, 20 H, 1 O; 31 atoms) and rebuild the formula C10H20O from the model alone. Stereochemistry: locate the three stereocentres on the printed model and confirm the R, S, R assignment with the CIP priority rules. Functional groups: find the hydroxyl group (-OH) on the model and name it. File and printing STL mesh of 329,522 triangles, a closed (watertight) single solid. Coordinates are in ångström and STL stores no unit, so scale the model deliberately in your slicer. Measured bounding box: 7.632 × 7.577 × 5.651 Å; at scale factor 10 (1 Å to 10 mm, file read in millimetres) the print measures about 76.3 × 75.8 × 56.5 mm. SHA-256: cd008dfa58058aaef8069ef45ca3878a6e85ddcdd0e10002c4b621d810bf0ea9. Validation InChIKey identical to the PubChem record (PubChem FTP SDF, file dated 2026-10-08), including the stereo layer: NOOLISFMXDJSKH-KXUCPTDWSA-N Molecular formula and hydrogen-bond donor/acceptor counts identical to PubChem Stereocentres in PubChem: 3 defined, 0 undefined; the defined count matches this record Mesh: triangle count in the header equals the actual count; 0 edges not shared by exactly two triangles; 1 connected solid; SHA-256 equal to the published file Source, licence and identifiers Full record: molgod.org/molecule/2216-51-5 (https://molgod.org/molecule/2216-51-5/?utm_source=nih3d&utm_medium=referral&utm_campaign=edu-3d-models) · Licence and provenance record: molgod.org/licenses/stl/2216-51-5 (https://molgod.org/licenses/stl/2216-51-5/) · Same file on Wikimedia Commons: File:L-menthol-3D-molecular-model-engraved-CAS-2216-51-5.stl (https://commons.wikimedia.org/wiki/File:L-menthol-3D-molecular-model-engraved-CAS-2216-51-5.stl) MolGod ID: MG_954-696-860-97 (https://molgod.org/id/MG_954-696-860-97) Wikidata: Q407418 (https://www.wikidata.org/wiki/Q407418) EC number: 218-690-9 ChemSpider ID: 15803 InChIKey: NOOLISFMXDJSKH-KXUCPTDWSA-N SMILES: C[C@@H]1CC[C@H]([C@@H](C1)O)C(C)C Molar mass 156.26 g/mol (exact mass 156.151415257) Licence: CC BY-SA 4.0 (licence text (https://creativecommons.org/licenses/by-sa/4.0/)). Required attribution: "L-menthol 3D model by MolGod.org — https://molgod.org/molecule/2216-51-5/ — CC BY-SA 4.0".