Authors: Masayuki Ogawa, Jyunichi Koyanagi, Katsuya Sakuma, Akira Tanaka and Katsumi Yamamoto
Journal: Journal of heterocyclic chemistry, vol 36, issue.3, pages 819–822, year 1999
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http://onlinelibrary.wiley.com/doi/10.1002/jhet.5570360340/pdf
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10.1002/jhet.5570360340