New Chiral Nitrones in the Synthesis of Modified Nucleosides von Fischer, Róbert, Drucková, Alexandra, Fiera, Lubor, Rybár, Alfonz, Hametner, Christian, Cyra, MichaŠ K.

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2-Triazolylpyrimido[1,2,3-cd]purine-8,10-diones via 1,3-dipolar cycloadditions to 2-ethynylpyrimido[1,2,3-cd]purine-8,10-dione von Simo, Ondrej, Rybár, Alfonz, Alföldi, Juraj

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9,9′-Thiobis-(1,2,3,4,7,8-hexahydro-7-methyl-6H-pyrimido[1,6-a]pyrimidine-6,8-dione) von Šimo, Ondrej, Rybár, Alfonz, Alföldi, Juraj, Pätoprstý, Vladimír

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Synthesis of 1,3-Dimethyl-8-(1,2,3,4-tetrahydroxybutyl)- and 1,3-Dimethyl-8-(1,2,3,4,5-pentahydroxypentyl)-7H-purine-2,6-(1H,3H)-diones von Rybár, Alfonz, Alföldi, Juraj, Fedoroňko, Michal, Kozák, Ján

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New [c,d]-Fused Purinediones: 2-Substituted 9-Methyl-4,5-dihydro-6H,8H-pyrimido-[1,2,3-cd]purine-8,10(9H)-diones von Šimo, Ondrej, Rybár, Alfonz, Alföldi, Juraj

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7,8-Disubstituted [1,3]-thiazino-[2,3-f]-purine derivatives von Hesek, Dušan, Rybár, Alfonz

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Annulated Heterocyclo-Purines. Part 2. Fused Six- and More-Membered Heterocyclo-Purinediones, -Purinones and -Purineimines von Rybar, Alfonz

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New [f]-Fused Theophyllines via Intramolecular Nucleophilic Addition of Alkyl (E)-4-[(8-Substituted)theophyllin-7-yl]-2-butenoate von Hesek, Dušan, Rybár, Alfonz, Bella, Juraj

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Annulated Heterocyclo-Purines. Part 1. Fused Five-Membered Heterocyclo-Purinediones, -Purinones, and -Purineimines von Rybar, Alfonz

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New [f]-Fused Theophyllines: A Simple One-Step Synthesis of the Pyrimido[2,1-f]purine System via 8-Azidopurines von Hesek, Dušan, Tegza, Marian, Rybár, Alfonz, Považanec, František

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ChemInform Abstract: 2-Triazolylpyrimido[1,2,3-cd]purine-8,10-diones via 1,3-Dipolar Cycloadditions to 2-Ethynylpyrimido[1,2,3-cd]purine-8,10-dione von Simo, Ondrej, Rybar, Alfonz, Alfoeldi, Juraj

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1-OXOALKYLXANTINES AND METHOD OF THEIR PREPARATION von TURCANI PETER, RYBAR ALFONZ

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1-OXOALKYLXANTINES AND METHOD OF THEIR PREPARATION von TURCANI PETER, RYBAR ALFONZ

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ChemInform Abstract: 9,9′-Thiobis-(1,2,3,4,7,8-hexahydro-7-methyl-6H-pyrimido [1,6-a]pyrimidine-6,8-dione) von Simo, Ondrej, Rybar, Alfonz, Alfoeldi, Juraj, Paetoprsty, Vladimir

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ZPUSOB CISTENI ANORGANICKYCH NEBO ORGANICKYCH SOLI KYSELINY 7 LH TETRAZOL 1 YL P ACETAMIDOCEFALOSPORANOVE von HORSAK IVAN, RYBAR ALFONZ CSC

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METHOD OF 3-METHYL-1-/5-OXOHEXYL/-7-N-PROPYL-3,7-DIHYDRO-1H-PURINE-2,6-DIONE PREPARATION von RYBAR ALFONZ CSC.,CS

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METHOD OF 3-METHYL-1-/5-OXOHEXYL/-7-N-PROPYL-3,7-DIHYDRO-1H-PURINE-2,6-DIONE PREPARATION von RYBAR ALFONZ CSC.,CS

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ALKYLESTERY 5 (5 FENYL 2 FURYL)TETRAZOL 2 YLOCTOVYCH KYSELIN A SPOSOB ICH PRIPRAVY von JANDA UBOMIR, HORSAK IVAN, RYBAR ALFONZ CSC

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7-(1H-TETRAZOLE-1-!L)-ACETAMIDOCEPHAELOSPORANE ACID'S INORGANIC OR ORGANIC SALTS CLEANING METHOD von HORSAK,IVAN,CS, RYBAR,ALFONZ,CS

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DERIVATY L,4 DIHYDROPYRIDINU von MARTVON AUGUSTIN DOC. CSC, CUPKA PAVOL, RYBAR ALFONZ CSC

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