`-CONH_(2) gt -COOR gt -NO_(2) gt -X gt -R``-CHO gt -CONH_(2) gt -NH_(2) gt -CO- gt -OH``-COOR gt - CONH_(2) gt - C -= N gt -CHO gt -CO-``-C -= N gt - COOH gt - NH_(2) gt - COOR gt - CONH_(2)`
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