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6-(Bromomethyl)-4-methoxy-5,6,7,8-tetrahydropyrido[3,2-d]pyrimidin-2-ol(compound 9) was synthe sized from 6-methylpyrimidine-2,4-diol(compound 1) through the crucial steps of 6-methyl alkylating and intramo lecular cyclization. The assignment of the struc