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- [5] APPLICATION OF LEVULINIC ACID AS PROTECTIVE GROUP TO SYNTHESIS OF TETRADECA-RIBONUCLEOTIDE U-A-U-A-U-A-U-A-U-A-U-A-U-A VIA MODIFIED PHOSPHOTRIESTER METHOD RECUEIL DES TRAVAUX CHIMIQUES DES PAYS-BAS-JOURNAL OF THE ROYAL NETHERLANDS CHEMICAL SOCIETY, 1978, 97 (03): : 73 - 80