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5-methyl-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid; CAS No.: 1522530-72-8; ChemShuttle's pyrrolopyrazine carboxylic acid serves as a building block for ADC linker synthesis. The methyl substitution enhances lipophilicity for antibody-drug conjugate optimization. Our custom synthesis services include site-specific conjugation studies using such heteroaromatic carboxylic acids.