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2003 © The Japan Society for Analytical Chemistry Separation and Determination of Synthetic Impurities of Sildenafil (Viagra) by Reversed-Phase High-Performance Liquid Chromatography Velupula NAGARAJU, * † Dasari SREENATH, ** Jammula TIRUMALA RAO, ** and Ramisetti NAGESWARA RAO *** * Chemistry Section, A. P. State Forensic Science Laboratory, Red Hills, Hyderabad-500 004, India ** Depa