In this section, we introduce a Twitter bot @retrosynthchan [7], which conducts retrosynthetic analysis by AiZynthFinder . The bot responds to a request given as a SMILES string and returns the results of retrosynthetic analysis for the given molecule. Users are expected to send a reply containing only a SMILES string right after the bot's screen name (e.g., @retrosynthchan c1ccccc1Br).