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(2004). A NOVEL AND DIRECT METHOD FOR THE PREPARATION OF 4-AMINO-1,1,3,3-TETRASUBSTTTUTED GUANIDINES AND OF [1,2,4]TRIAZOLO-FUSED HETEROCYCLIC DERIVATIVES. Organic Preparations and Procedures International: Vol. 36, No. 2, pp. 121-127.
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Abdul-Ghan et al. (2004) studied this question.
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