Cyclic Guanidines - Synthesis of 4,6,7,8-Tetrahydro-1h-Imidazo[1,2-A]pyrazolo[3,4-D]pyrimidin-7-Ones and 1,4,6,7,8,9-Hexahydropyrazolo[3',4'-4,5]pyrimido[2,1-C][1,2,4]triazin-7-Ones
Journal article published in 1990 by
R. Ferroni,
D. Simoni,
P. Orlandini,
M. Guarneri,
Bertolasi,
Ferretti 
