apparent monomer

https://doi.org/10.1351/goldbook.11535
Monomer which from the name of a polymer appears to have been used in the synthesis of the latter when it has actually been prepared from different precursor(s).
Note: The term replaces both of the formerly used terms "hypothetical monomer" and "implicit monomer", which are now deemed to be obsolete.
Source:
PAC, 2016, 88, 1073. (Source-based nomenclature for single-strand homopolymers and copolymers (IUPAC Recommendations 2016)) on page 1075 [Terms] [Paper]