[1]
“A one-pot synthesis of 7,11-diaryl-2,4-diazaspiro[5,5]undecane-3-oxo (or thioxo)-1,5,9-triones”, J. Bangla. Chem. Soc., vol. 24, no. 2, pp. 135–142, Feb. 2012, doi: 10.3329/jbcs.v24i2.9702.