diethyl 2-triphenylphosphoranylidene-3-oxosuccinate
diethyl 2-oxo-3-triphenylphosphoranylidenebutanedioate
2-Oxo-3-(triphenyl-λ5-phosphanylidene)-succinic acid diethyl ester
Diethyl-triphenylphosphoranylidenoxalacetat
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