4-Substituted-3-alkyl-3,4-dihydro-2H-1, 3-benzoxazin-2-ones II (1,2). Solvolytic transformations of urea and thiourea derivatives into 1-alkyldihydro-6-(2-hydroxyaryl)-1,3,5-triazine-2,4-(1H, 3H)diones

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