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The 4,5-diaminopyrimidine was  suspended  in  ten times its weight  of  a  one-to-one mixture of  ethyl orthoformate and acetic anhydride, the mixture heated slowly with stirring to reflux ,and refluxed  for one  hour  after  all  the  solid  dissolved.

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sltmac(½ð±Ò+1): лл½»Á÷ 2011-08-23 14:39:41
Ìì¿ÕÖ®ºÛ(½ð±Ò+1): 2011-08-23 14:46:03
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sltmac(½ð±Ò+1): ¸ÐлӦÖú~ 2011-08-23 14:39:30
Ìì¿ÕÖ®ºÛ(½ð±Ò+2, ·­ÒëEPI+1): лл 2011-08-23 14:45:43

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sltmac(½ð±Ò+1): 2011-08-23 14:39:45
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sltmac(½ð±Ò+1): 2011-08-23 14:39:48
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