(S)-4-amino-2-(3,5-dinitro-4-oxopyridin-1(4H)-yl)-4-oxobutanoic acid

His-Ser-Asn-Gly

Nα,Nca-di-tert-butyloxycarbonylasparagine

L-天冬氨酸 4-乙酯

asparagine amide