2-Benzamido-4-oxopentansaeure,N-Benzoyl-β-acetylalanin

(R)-2-((2,2,5,7,8-pentamethylchromane)-6-sulfonamido)-5-(trimethylsilyl)pent-4-ynoic acid

(S)-2-(2,2,5,7,8-Pentamethyl-chroman-6-sulfonylamino)-5-trimethylsilanyl-pent-4-ynoic acid