p. 847 - 853
(2007/10/02)benzyl chloroformate
(2R)-2-(3,4-dihydroxyphenyl)-2-<(4-ethyl-2,3-dioxopiperazin-1-yl)carbonylamino>acetic acid
benzyl 6β-amino-6α-methylthiopenicillanate
N,N-bis(trimethylsilyl)formamide
(2R)-2-<3,4-bis(benzyloxycarbonyloxy)phenyl>-2-<(4-ethyl-2,3-dioxopiperazin-1-yl)carbonylamino>acetic acid