monosubstituted

mon·o·sub·sti·tut·ed

(mon'ō-sŭb'sti-tū'tĕd), chemistry denoting an element or radical, only one atom or unit of which is found in each molecule of a substitution compound.

monosubstituted

(mŏn″ō-sŭb′stĭ-tūt″ĕd) Having only a single molecule replaced.