Assertion: organic chemistry's derivative | /r/SimilarTo | compound
Facets:
value: in the past
type: TEMPORAL
Source sentences:
text: In the past, derivative also meant a compound that can be imagined to arise from another compound, if one atom or group of atoms is replaced with another atom or group of atoms, but modern chemical language now uses the term structural analog for this meaning, thus eliminating ambiguity.[citation needed]