This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Pechmann Reaktionsmechanismus .svg mechanism of the Pechmann reaction Mechanismus der Pechmann Reaktion Own Flauski talk PDchem Cczero Pechmann condensation
Page 2023 Free-images.com. All images are Public Domain