In this paper, an unprecedented method for hindrance of the photodimerization of coumarin derivative induced by pillar[5]arene-based molecular recognition in water is reported.
![Graphical abstract: Hindrance of photodimerization of coumarin derivative induced by pillar[5]arene-based molecular recognition in water](http://hg.y866.cn/compound/lib/scimg/usr/1/C6RA26741F.jpg)
