thumb|An sp2-hybridized carbon atom, with re and si faces
thumb|An sp2-hybridized carbon atom, with re and si faces
In stereochemistry, prochiral molecules are those that can be converted from achiral to chiral in a single step, such as changing one atom. An achiral species which can be converted to a chiral in two steps is called proprochiral.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).