5-(4-Bromophenyl)-2,8-bis(methylsulfanyl)-5H-pyrimido[5',4':5,6]pyrano[2,3-d]pyrimidine-4,6-diol;5H-pyrano[2,3-d:6,5-d']dipyrimidine-4,6-diol, 5-(4-bromophenyl)-2,8-bis(methylthio)-
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