Premodifier: chemical
Head noun: precursor

Same concepts
http://dbpedia.org/resource/Precursor_(chemistry)

Broader concepts

labelprovenanceconfidence
chemicalisap:4101338840.584405
substanceisap:3518811380.499670
materialisap:4115790480.385142

Narrower concepts

labelprovenanceconfidence
amino acidisap:2870703750.594554