TY  - JOUR 
T1  - Silica functionalized sulfonic acid catalyzed one-pot synthesis of 4,5,8a-triarylhex-ahydropyrimido[4,5-d]pyrimidine-2,7(1H,3 H)-diones under liquid phase catalysis
JO  - Journal of the Brazilian Chemical Society
A1  - Gupta, Princy
A1  - Kumar, Vineet
A1  - Paul, Satya
SN  - 0103-5053
UL  - 10.1590/S0103-50532010000200022
VL  - 21 
Y1  - 2010
PB  - Brasil 
ER  -