Answer:

acetyl

Answer	Crossword Clue
ACETYL	Like a vinegar radical
ACETYL	... chloride (dyemaking chemical)
ACETYL	Radical in aspirin

ACETYL	Part of aspirin
ACETYL	Vinegar radical
ACETYL	... radical
ACETYL	... group, in organic chemistry
ACETYL	Organic chemistry group
ACETYL	Acid derivative