"precursor compounds" refers to substances that act as building blocks or starting materials for creating or producing other substances. Full definition
In this collaboration, Dickerson designed the synthesis of drugs from precursor compounds prior to scheduling, when they are not available from research supply companies. (sciencedaily.com)
They replaced particular carbon atoms in the hexagonal lattice with boron and nitrogen atoms using surface chemistry, by placing suitable organic precursor compounds on a gold surface. (nanotech-now.com)
You don't necessarily have to supplement at all, because broccoli and brussel sprouts both have tons of the vital glucosinolate glucobrassicin precursor compounds. (supernaturalacnetreatment.com)