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−20°C
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R H Springer et al.
Journal of medicinal chemistry, 19(2), 291-296 (1976-02-01)
A series of 3-substituted 5,7-dihydroxypyrazolo[1,5-alpha]pyrimidines containing various aromatic [phenyl- (3e), 3-pyridyl- (3f), p-bromophenyl- (3g), p-chlorophenyl- (3h), p-acetamidophenyl- (3i), p-tolyl- (3j), m-tolyl- (3k), 3,4-methylenedioxyphenyl- (3m), or naphthyl- (3n)] or nonaromatic [hydrogen- (3a), nitro- (3b), bromo- (3c), or chloro- (3d)] substituents in