p. 3357 - 3358
(2007/10/03)p. 731 - 744
(2007/10/02)p. 6109 - 6112
(2007/10/02)3-Oxo-cyclopentanecarboxylic acid
(5R,7R)-2,4-Dioxo-1,3-diaza-spiro[4.4]nonane-7-carboxylic acid
(5R,7S)-2,4-Dioxo-1,3-diaza-spiro[4.4]nonane-7-carboxylic acid
(1S)-isopropyl 3-oxocyclopentane-1-carboxylate
isopropyl 3-oxocyclopent-1-ene-1-carboxylate