Cinidon-ethyl (BAS 615H) is a herbicide of isoindoldione class which selectively controls a wide spectrum of broadleaf weeds in cereals. Cinidon‐ethyl strongly inhibited protoporphyrinogen oxidase (Protox) activity in vitro, with I50 values of approximately 1 nM for the enzyme isolated from the weed species and from wheat. Cinidon-ethyl was approved in the EU in the early 2010s, but authorization was revoked due to lack of interest from the applicant.