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- [21] STRUCTURAL VARIATIONS OF N-ACETYLNEURAMINIC ACID .14. SYNTHESIS OF THE BETA-METHYL KETOSIDES OF 4-OXO-N-ACETYLNEURAMINIC, 7-OXO-N-ACETYLNEURAMINIC, AND 8-OXO-N-ACETYLNEURAMINIC ACIDS AND THE CORRESPONDING 7,7-DIMETHOXY AND 8,8-DIMETHOXY DERIVATIVES - THEIR BEHAVIOR TOWARDS CMP-SIALATE SYNTHASE LIEBIGS ANNALEN DER CHEMIE, 1990, (01): : 83 - 91