Rotaxanes are dumbbell-shaped mechanically interlocked molecules in which one or more ring-shaped molecules are threaded through a linear segment, known as the axle. To keep the ring from sliding off, two bulky groups, sometimes called stoppers, are added to the ends of the axle. Making a rotax...

Source: [Phys.org](https://phys.org/news/2026-07-selfbuilding-molecular-nextgeneration-drug-delivery.html)

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