Esters and amides of 3-R-2,8-dioxo-7,8-dihydro-2H-pyrrolo|1,2-a||1,2,4|triazino|2,3-c|quinazolin-5a(6H)-carboxylic(-propanoic) acids: synthesis and biological activity - V. V. Stavytskyi; I. S. Nosulenko; K. I. Kandybey; Yu. Voskoboinik; S. I. Kovalenko (Journal of organic and pharmaceutical chemistry, 2020)