Tanaka, Kiyoshi; Suzuki, Takashi; Maeno, Seiji; Mitsuhashi, Keiryo.
Synthesis and Reaction of 5-Amino-3-trifluoromethylisoxazole and -pyrazole-4-carboxylic Acids
J. Heterocycl. Chem.; 23; 1986; 1535-1538
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https://www.jhetchem.com/cd2html.php?file=19861535