prodrug

https://doi.org/10.1351/goldbook.13943
Compound that undergoes biotransformation before exhibiting pharmacological effects.
Note: Prodrugs can thus be viewed as drugs containing specialized nontoxic protective groups used in a transient manner to alter or to eliminate undesirable properties in the parent molecule.
Source:
PAC, 2012, 84, 377. (Terminology for biorelated polymers and applications (IUPAC Recommendations 2012)) on page 402 [Terms] [Paper]