(S)-5-methyl-3-nitromethyl hexanoic acid ethyl ester

(3S)-3-氰基-5-甲基己酸

benzyl (S)-3-((((benzyloxy)carbonyl)amino)methyl)-5-methylhexanoate

diethyl 2-[(2S)-4-methyl-1-nitropentan-2-yl]propanedioate