The 2D molecule editor hosted on chemical.space/editor is shown in Figure . Users can utilize it to draw structural formulas from scratch in their browser and post them to Twitter in SMILES or CML format using the button at the bottom of the editor. We have also prepared a button that allows users to submit their structural formula to the retrosynthetic analysis bot introduced in Case Study 1. Structural formulas posted in CML format can be re-edited by opening the URL in the tweet, which is useful for open discussion on compounds on the SNS.