[5-(tert-Butyl-dimethyl-silanyloxy)-3-imino-1-oxy-3H-benzo[c][1,2]oxazin-7-yl]-methanol

2,2-Dimethyl-propionic acid 3-oxo-5-((3aS,6aR)-2-oxo-tetrahydro-[1,3]dioxolo[4,5-c]pyrrol-5-yl)-chroman-7-ylmethyl ester

2,2-Dimethyl-propionic acid 3-tert-butoxycarbonylmethoxy-5-(2,5-dihydro-pyrrol-1-yl)-4-methoxycarbonylmethyl-benzyl ester

2,2-Dimethyl-propionic acid 4-diazo-3-oxo-5-((3aS,6aR)-2-oxo-tetrahydro-[1,3]dioxolo[4,5-c]pyrrol-5-yl)-chroman-7-ylmethyl ester

2,2-Dimethyl-propionic acid 3-tert-butoxycarbonylmethoxy-4-methoxycarbonylmethyl-5-((3aS,6aR)-2-oxo-tetrahydro-[1,3]dioxolo[4,5-c]pyrrol-5-yl)-benzyl ester