A type of stereoisomer that differs in the configuration of a single stereocenter.
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methyl (2S,4S,6R)-N-tert-butoxycarbonyl-4-(N-tert-butoxycarbonylamidobenzyl)pyroglutamate
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester