p. 3065 - 3073
(2011/02/25)p. 9509 - 9524
(2007/10/03)p. 752 - 753
(2007/10/03)(S)-(+)-ethyl 4-oxocyclopent-2-ene acetate
((1S)-4-oxocyclopent-2-enyl)acetic acid
(S)-3-di(ethoxycarbonyl)methyl-1-cyclopentanone
(S)-2-(1,4-Dioxa-spiro[4.4]non-7-yl)-malonic acid diethyl ester
ethyl ((7S)-1,4-dioxaspiro[4.4]non-7-yl)acetate