(4S)-tert-butyl 5-(ethylamino)-4-(2-hydroxydodecanamido)-5-oxopentanoate

(S)-tert-butyl 5-(ethylamino)-5-oxo-4-(2-oxododecanamido)pentanoate

N-(p-methylaminobenzoyl)-L-glutam-α-ethylamide t-butyl ester

N--L-glutam-α-ethylamide t-butyl ester

(S)-4-{4-[(2,4-Diamino-pteridin-6-ylmethyl)-methyl-amino]-benzoylamino}-4-ethylcarbamoyl-butyric acid