@article {30430,
	title = {Novel pentaheterocycles. First general synthesis entry to functionalized derivatives of pyrido[2,3-f:6,5-f{\textquoteright}]di-[1,2,4]triazolo[4,3-a]pyrimidin-5(1H)-diones},
	journal = {Monatsch. Chem.},
	volume = { 135,},
	year = {2004},
	pages = { 211-222.},
	author = {Mosselhi, Mosselhi A. N and Magda A. Abdalla and Thoraya A. Farghaly and Ahmad Sami Shawali}
}
