The introduction of a metal atom or ion into a compound.
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rel-(4R*,5S*)-4,5-Diphenyloxazolidine-2-one
(S)-2,6-Dimethyl-4-p-tolyl-1,4-dihydro-pyridine-3,5-dicarboxylic acid 3-tert-butyl ester 5-ethyl ester