bioisostere

https://doi.org/10.1351/goldbook.BT06798
A compound resulting from the exchange of an atom or group of atoms with another, broadly similar, atom or group of atoms.
Source:
PAC, 1998, 70, 1129. (Glossary of terms used in medicinal chemistry (IUPAC Recommendations 1998)) on page 1129 [Terms] [Paper]