tert-butyl 2-(4-methoxy-4-oxobut-2-en-2-yl)diazene-1-carboxylate

methyl 3-(phenylcarbamoyldiazenyl)but-2-enoate

(isocyanatomethyl)triphenylphosphonium iodide

iodure d'ethylenedioxy-2,2 (hydroxy-2' ethoxy)-5 pentyl-4 triphenylphosphonium