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KONDO, M., IWASAKI, H., YASUI, K., & MIYAKE, M. (1978). ChemInform Abstract: STUDIES ON PHTHALIDE DERIVATIVES. I. SYNTHESIS OF 2-BENZOYL-5-DIMETHYLAMINOBENZOIC ACIDS. Chemischer Informationsdienst, 9(8). doi:10.1002/chin.197808187 
10.1002/chin.197808187