In recent years, a variety of molecular machines that are capable of changing their state in response to external chemical, electrochemical, and photochemical stimuli have been prepared.[1, 2] Among those, self-locking [3] systems constitute a highly topical category because of their structural attractiveness, their ability to operate as an ON/OFF toggle for hiding and exposing functional groups, and their potential as nanomechanical devices. ...
![diethyl 2-[1-(4-nitrophenyl)ethyl]propanedioate Structure](https://image.chemsrc.com/caspic/348/37556-09-5.png)