Synthesis of (4S*,5S*)-Diphenyl-1,3,4,5-tetrahydro-2H-[1]benzopyrano [4,3-d]pyrimidine-2-thiones by Base-Catalyzed Cyclocondensation of (E)-3-Benzylideneflavanones with Thiourea, and Determination of Their Monoacetylation Site.

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