2-氧代环戊羧酸乙酯

N-氟-5-(三氟甲基)吡啶-2-磺酸盐

1,2-二氯乙烷

sodium enolate of ethyl 2-oxocyclopentanecarboxylate

1-Trimethylsiloxy-2-aethoxycarbonyl-cyclopenten-(1)