Synthesis of Novel DPPH-Free Radical Scavenger <i>Se</i>-Containing Fused Chalcogenophenes: 2-Alkyl-7-Cyano-4-Imino-3-Phenyl-6-(pyrrolidin-1-yl)-3,4-Dihydroselenopheno[3,2-<i>d</i>]Pyrimidines
Polycyclic aromatic compounds