The act of substituting one chemical or functional group for another in a reaction.
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2,5-diphenyl pyrrolo<3,4-c>pyrazole-(2H,5H)-4,6-dione
(1S,3R,4S,5R,6R,7R)-1-((4S,5R)-4-Acetoxy-5-methyl-3-methylene-6-phenyl-hexyl)-4,6,7-trihydroxy-3-(5-methyl-4H-[1,2,4]triazol-3-yl)-2,8-dioxa-bicyclo[3.2.1]octane-4,5-dicarboxylic acid dimethyl ester
