Theophylline 3D Molecular Model — CAS 58-55-9

Theophylline (C7H8N4O2, CAS 58-55-9) — a free educational 3D molecular model for teachers and students, by MolGod.org. Symbols are engraved into every atom, so students read atoms by symbol, not by colour. Which rings can the class see in Theophylline? The answer is two rings (one 5-membered and one 6-membered), fused along a shared edge, one of them aromatic, joined up by 22 bonds altogether (15 single, 3 double and 4 aromatic, drawn in Kekulé form). Give each pair of students the model and a…

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