3-(2-Cyclohexyl-1H-indol-3-yl)-2-[(Z)-hydroxyimino]-propionic acid ethyl ester
(E)-ethyl 3-[5-(benzyloxy)-1H-indol-3-yl]-2-(hydroxyimino)propanoate
(E)-Ethyl 2-(benzyloxyimino)-3-(5-bromo-1H-indol-3-yl)propanoate
(E)-ethyl 3-(5-bromo-1H-indol-3-yl)-2-(trityloxyimino)propanoate
(E)-ethyl 3-(7-bromo-1H-indol-3-yl)-2-(trityloxyimino)propanoate