Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Each diastereomer of N-(−)-camphanoyl-(3-methylthio)-1-aminopropane chirally deuteriated at C-1 has been synthesized and compared to deuteriated samples derived from L-methionine enzymic decarboxylation. Here we report that decarboxylatlon occurs in a retentive mode.