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.
PutrescinestickAndBall. stickandball model of putrescine molecule Prepared using Discovery Studio Visualizer and GIMP Own Karlhahn Tetramethylendiamine
Page 2023 Free-images.com. All images are Public Domain