pyrazinyl en · NOUN
Etymology
From pyrazine + -yl.
Meanings
-
(especially, in-compounds, uncountable) The radical derived from pyrazine.
Other highly effective heterocyclic substituents were pyrazinyl and quinoxalyl.
1951, Apollonia Frances Olson, Helen G. Tibbitts, A Study of Head Nurse Activities in a General Hospital, 1950, page 163: