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Cushman, Mark Kanamathareddy, Suseela Clerq, Erik de Schols, Dominique Goldman, Mark E. Bowen, Julie A. Journal of Medicinal Chemistry, 1991 , vol. 34, # 1 p. 337 - 342
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Kahl Chemische Berichte, 1898 , vol. 31, p. 146 Full Text Show Details Geigy and Co. Patent: DE49970 Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 2, p. 50