Cite

    Neda Firoozi et al.. “Synthesis of pyrimido[4′, 5′:5, 6][1, 4]dithiepino[2, 3-b]quinoxalines: Derivatives of a novel seven membered ring system.” Phosphorus, sulfur, and silicon and the related elements, vol. 192, 2017, pp. 442–445. http://access.bl.uk/ark:/81055/vdc_100044868224.0x00005f