N.N[C@H](C([NH:10][C@H:11]([C:16]([OH:18])=[O:17])[CH2:12][CH2:13][S:14][CH3:15])=O)CCSC>>[NH2:10][C@H:11]([C:16]([OH:18])=[O:17])[CH2:12][CH2:13][S:14][CH3:15]When the reaction was carried out under otherwise the same conditions but without addition of ammonia there was formed methionine in a yield of 64.5% besides a yield of 21% of methionine dimer (N-methionyl-methionine).
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