N-isopropyl-N'-phenyl-p-phenylenediamine

N-isopropyl-N'-phenyl-p-phenylenediamine (C15H18N2, CAS 101-72-4) — a free educational 3D molecular model for teachers and students, by MolGod.org. Read the atoms directly: each sphere bears an engraved element symbol. At its heart, N-isopropyl-N'-phenyl-p-phenylenediamine is built around two 6-membered rings, both aromatic. The model shows 36 bonds: 24 single and 12 aromatic, drawn in Kekulé form. Counting task: 15 C + 18 H + 2 N gives 35 engraved spheres; can the class rebuild the formula C15H18N2 from the model alone? Before any theory, let students hunt on the model for the two secondary amino groups (-NH-). Full record and more free models: https://molgod.org/molecule/101-72-4/?utm_source=sketchfab&utm_medium=referral&utm_campaign=edu-3d-models Licence & provenance: https://molgod.org/licenses/stl/101-72-4/ Required attribution (CC BY-SA 4.0): "N-isopropyl-N'-phenyl-p-phenylenediamine 3D model by MolGod.org — https://molgod.org/molecule/101-72-4/ — CC BY-SA 4.0"