_:b665388058 . _:b665388058 "A and B are a matched small molecular pair (MMP) if their chemical structures define by a single, relatively small, well-defined structural modification.\n\nWhile this is normally called \"matched molecular pair\" in the cheminformatics literaturel, it is labeled as \"matched small molecular pair\" so as to reduce confusion with peptides and other macromolecules, which are also referenced as \"molecules\" in some contexts.\n\nThis relationship is symmetric, meaning if A is a MMP with B iff B is a MMP with A.\n\nThis relationship is not transitive, meaning that A is a MMP with B and B is a MMP with C, then A is not necessarily an MMP with C." . _:b665388058 . _:b665388058 . _:b665388058 . _:b665388058 . _:b665388058 . _:b665388058 . _:b665388058 .