4-Chloro-5H-pyrrolo[3,2-d]pyrimidine-6-carboxylic Acid Ethyl Ester is an organic building block that is made from 4-Chloro-5H-pyrrolo[3,2-d]pyrimidine (C380040), which is a chlorinated pyrrolopyrimidine used in the preparation of compounds with antibacterial and antitumor activities.