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Minoxidil Impurity 5 Minoxidil Impurity 12 Minoxidil Impurity 20 2,4-diamino-6-methoxypyrimidine 3-oxide 2,4-Pyrimidinediamine, 6-methoxy-, 3-oxide 2,6-diamino-4-methoxypyrimidine 1-oxideQ: What is 2,6-diamino-4-methoxypyrimidine 1-oxide Q: What is the CAS Number of 2,6-diamino-4-methoxypyrimidine 1-oxide