[CH3:1][C:2]([O:5][C:6](=[O:28])[C:7](=P(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[CH3:8])([CH3:4])[CH3:3].[CH:29]1[CH:30]=[CH:31][C:32]([CH:37]=[O:38])=[C:33]([CH:35]=O)[CH:34]=1>>[CH3:1][C:2]([O:5][C:6](=[O:28])/[C:7](/[CH3:8])=[CH:35]/[C:33]1[CH:34]=[CH:29][CH:30]=[CH:31][C:32]=1[CH:37]=[O:38])([CH3:4])[CH3:3]From 2-(triphenylphosphoranylidene)propanoic acid 1,1-dimethylethyl ester and ortho phthalaldehyde
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