retrosynthesis
(2)
b12 Labs
b12 Labs is a San Francisco startup (Y Combinator S25) building AI agents for pharmaceutical and biotech chemistry. Its platform designs synthesis routes, plans and optimizes reactions, and turns those plans into robot-ready code for automated labs, aiming to compress early-stage drug discovery from years to months. The company was founded in 2025 by chemists Zlatko Joncev and Andres Bran, who met at EPFL's Lab of Artificial Chemical Intelligence.
Mstack
Mstack is an AI-native chemical R&D and manufacturing company that helps enterprises source and produce custom specialty chemicals. It pairs a cross-border network of vetted suppliers across India, the Middle East and Asia with Chemstack AI, a closed-loop platform that designs and ranks synthetic routes to compress molecule development from roughly 18 months to days. Founded in 2022 by former Lightspeed investor Shreyans Chopra, the company serves 100+ enterprise customers and is backed by Lightspeed and Alpha Wave Global.