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synthesis structure elucidation α-³Ù±ð°ù±è¾±²Ô±ð´Ç±ô chalcone derivatives aldolcondensation synthesis of reserpine reserpine structure prevention measures fluorosis water nano materials pinacol pinacalone rearragements friedlandar and pfintzinger methods skarup synthesis isoquninoline quninoline green chemistry nernst equation electrochemistry \ development identification drugs mercury nickel cobalt binary mixture identification of functional groups organic compounds separation