Precursor

/pɹɪkˈɜːsɐ/

/pɹiˈkɝsɝ/

Precursor

*** a person or thing that comes before somebody/something similar and that leads to or influences its development

synonyms : forerunner

a substance from which another substance is formed (especially by a metabolic reaction)

Examples

1. Gluconeogenic precursor three is glutamate.

2. Meet pumpkin spice's precursor, aka the spice daddy, aka mixed spice.

3. Their precursor is cholesterol.

4. Precursor four is aspartic acid.