1. Synthetic Communications, Volume 25, Issue 4 February 1995 , pages 507 - 514
An Efficient Synthesis of 4-Hydroxy-1H-indole-2-carbonitrile and Its Conversion to DPI 201-106
Kimberly G. Estep
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http://dx.doi.org/10.1080/00397919508011384
Facile Entry to 4- and 5-Hydroxybenzofuran and to Their Amino Derivatives
Carlo Bonini; Graziella Cristiani; Maria Funicello; Licia Viggiani
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http://dx.doi.org/10.1080/00397910600634118