Pyridopyrimidines. Part-VII. Synthesis and Antibacterial Activity of 4-lminopyrido[2, 3 - d] pyrimidin- 2( 1 H)-thiones, 2--Thioxopyrido[2, 3 - d]pyrimidin-4(3H)-ones and related Compounds - CHAITANYA G. DAVE (1989)