In physics, Everett's multiverse is "a hypothetical collection of potentially diverse observable universes, each of which would comprise everything that is experimentally accessible by a connected community of observers" . The concept of the chemical multiverse is schematically shown in Figure . In other words, the multiverse "is a hypothetical group of multiple universes." By rough analogy with the cosmic multiverse, here we introduce the concept of the chemical multiverse as the group of numerical vectors that describe the same set of molecules differently. In other words, a chemical multiverse is a group of chemical spaces, each one defined by a given set of descriptors.