This refers to a reaction in which a catalyst facilitates the addition of one substance to another.
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3-Heptanone, 6-hydroxy-2,2-dimethyl-7-phenoxy-
N-butyl-4-methyl-N-(phenylethynyl)benzenesulfonamide
(1S,4S)-3-Benzenesulfonyl-4-vinyl-cyclopent-2-enecarboxylic acid tert-butyl ester
