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3H-pyrrolo[3,2-d]pyrimidin-4(5H)-one; CAS No.: 5655-01-6; 3H-Pyrrolo[3,2-d]pyrimidin-4(5H)-one, a pyrrolopyrimidine lactam, is part of our **Library of Compounds** for purine mimicry in kinase inhibition. The lactam structure enhances hydrogen bonding capacity. As a **worldwide chemical supplier**, we deliver this scaffold for cancer immunotherapy research, with **custom synthesis** services optimizing ring-closing metathesis for scalable production.