propionic acid derivatives

Opren was one of the chemical class of propionic acid derivatives, of which five were already on the market in many forms.

Loxoprofen (INN) is a non-steroidal anti-inflammatory drug in the propionic acid derivatives group, which also includes ibuprofen and naproxen among others.

Although its name does not suggest similarity with propionic acid derivatives (including ketoprofen, flurbiprofen, naproxen, ibuprofen, etc.), ketorolac is an isostere of ketoprofen.