B. R = R՛ = N(CH2–CH2OH): 2,2՛,2՛՛,2՛՛՛,2՛՛՛՛,2՛՛՛՛՛-{[8-(1-piperidyl)pyrimido[5,4-d]pyrimidin-2,4,6-triyl] trinitrilo} hexaethanol,
B. R = R՛ = N(CH2–CH2OH): 2,2՛,2՛՛,2՛՛՛,2՛՛՛՛,2՛՛՛՛՛-{[8-(1-piperidyl)pyrimido[5,4-d]pyrimidin-2,4,6-triyl] trinitrilo} hexaethanol,